claims depot shelf
High-Temperature Superconductivity
Formal claims (Lean)
Stated claims
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The paper's central claim is that the continuously doping-dependent power-law self-energy observed at the node of high-$T_c$ cuprates is not a quantum-critical signature but a hydrodynamic consequence of poorly screened, spatially nonlocal repulsions. Its central result, Eqn. 6, gives $\Gamma_{\mathrm{inel}}(k_F,\omega,T)\approx A_\gamma T^\gamma \Phi_\gamma(\omega/T)$ with $\gamma=2-1/\alpha$, obtained from the dynamically screened interaction $W(q,\omega)$ whose superdiffusive pole follows from the $1/r^\alpha$ interaction. The derivation uses a diffusive irreducible polarization in the RPA combination $W^{-1}=V^{-1}+\Pi_{\mathrm{irr}}$; for $\alpha<2$ the characteristic momentum at energy transfer $\Omega$ scales as $q_\Omega\sim(\Omega/D_\alpha)^{1/\alpha}$, making tangential scattering dominate and producing scale covariance. The paper identifies the optimal-doping marginal Fermi liquid with $\alpha\to 1^+$ ($\gamma\to 1^+$), and increasing doping with larger $\alpha$ and larger fitted $\gamma$, up to the diffusive value $\gamma=1.5$ for $\alpha>2$.
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The central claim is stated as: "This result provides definitive proof that intrinsic in-plane biaxial compressive strain, decoupled from parasitic interfacial hole doping, is alone sufficient to induce high-temperature superconductivity approaching 60 K in strained bilayer films." The paper also asserts that the superconducting films are intrinsically electron-like (negative Hall coefficient), in contrast to the hole-like response of pressurized bulk crystals, and that both strain and pressure drive superconductivity by suppressing spin-density-wave order while modulating the correlation landscape.
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The authors claim that 45°-twisted FeSe/cuprate heterostructures form a nearly ideal CuFe2 Lieb lattice, and that this lattice hosts altermagnetism through two cooperating routes. The first uses checkerboard antiferromagnetic order on the Fe sites together with finite Cu–Fe interlayer hopping t0 to generate a d-wave spin splitting. The second uses the substrate to break the equivalence of the two Se atoms, making the next-nearest-neighbor Fe–Fe hoppings alternate (t ± δt), which alone splits the bands. DFT for FeSe/Bi2Sr2CuO6 confirms both routes, with splittings of 15 meV in the BiO2-cleaved structure and 25 meV when the CuO2 plane is exposed, and the splitting is carried mainly by the Fe d
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The central discovery is that an onsite Hund's exchange J can generate an effective attractive pairing channel in a single-band Hubbard model, even though U_eff = U - J remains predominantly repulsive. The paper derives the binding energy E_b = -(1/4)J n + (1/4)U_eff n^2, where n is the fractional band occupancy; the negative linear term dominates for small fractional n while the positive quadratic term wins near integer filling. This produces a superconducting dome in doping, with optimal doping p_opt = J/(2U_eff) + p_min and maximum gap Δmax = J^2/(16U_eff). The order parameter mirrors the tight-binding dispersion with d-wave symmetry for cuprates (via t_x = -t_y) and s±-wave symmetry for
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A mechanism similar to the standard phonon drag can give rise to anomalies in the thermopower of a metal, if the dragged collective mode is overdamped, with a damping coefficient that increases with lowering the temperature. This finding adds a piece to the puzzle of the strange-metal behavior observed in many different systems and supports the proposal that overdamped charge density fluctuations can be responsible for such a behavior in high-temperature superconducting cuprates.
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The author maintains that the Spin-Fermion-Hubbard Model, in which the Cu++ electrons form a square lattice of localized spins while the doped holes move along the oxygen sub-lattices and undergo a Kondo-like magnetic interaction with the localized spins besides the Hubbard-like electric repulsion, has led to a successful theory for High-Tc superconductivity in hole-doped cuprates, in contrast to the alternative that forms Zhang-Rice singlets and yields the t-J model.
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It is proved that near the critical point the infinite-dimensional effective action is diffeomorphic to a finite-dimensional catastrophe. Starting from the Ginzburg-Landau free energy functional, the Euler-Lagrange partial differential equation can be reduced to the cusp catastrophe model. The fermionic imaginary-time path integral is carried to the same cusp form by the Hubbard-Stratonovich transformation, Matsubara frequency expansion, and Grassmann algebra. The resulting framework is connected to adsorption potential theory to account for the catastrophic topological character of electron pairing in high-temperature superconductivity.
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Resonant inelastic X-ray scattering on HgBa₂Ca₂Cu₃O₈₊δ shows that the charge response is dominated by dynamic charge density fluctuations extending up to several hundred meV. At the momentum of maximum CDF intensity the paramagnon energy displays pronounced softening. The data therefore indicate a strong interplay among charge, lattice and spin excitations, supporting a cooperative mechanism in which the dynamic charge fluctuations mediate the coupling between these degrees of freedom.
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In Bi2267, high-resolution ARPES identifies multiple hole Fermi pockets that carry substantial electron pairing, manifested as energy gaps up to 42 meV even in lightly doped planes with p approximately 0.05; this pairing supports superconductivity at approximately 75 K while strong antiferromagnetic order and correlations remain present, showing that the two orders can coexist in a multi-pocket cuprate.
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The pairing mechanism is identified as the emergent local attraction counterintuitively generated from the originally strong local repulsion U. The emergent attraction is interpreted from attraction from reduced repulsion, originating from the release of the fluctuating doubly-occupied sites characterized from the false vacuum in the Mott insulator to the double-occupation-free d-wave SC states upon carrier doping. This instantaneous attraction is in contrast with the conventional BCS SC mediated by bosonic glues.
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Bipolar doping is achieved in (Sr,Eu)CuO2 and (Ca,Li)CuO2+δ infinite-layer films. ARPES reveals persistent antiferromagnetic band folding that coexists with superconductivity in both doping regimes. At hole doping ~0.07 set by the Luttinger volume, the folding emerges directly from the Fermi arcs of the film’s single Fermi surface, and the superconducting onset temperature exceeds 60 K.
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At sufficiently high pump fluences, 1.6 eV photoexcitation drives Bi2Sr2CaCu2O8+δ into a photostationary long-lived excited state whose Fermi surface undergoes a Lifshitz transition from hole-like to electron-like topology; the band evolutions are analogous to those from chemical doping and arise from a cooperative photodoping process involving charge transfer, effective-correlation renormalization, and defect-assisted trapping.
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Hole doping in the infinite-layer cuprate is realized in Sr1-xRbxCuO2 thin films by the synergistic effect of rubidium substitution and apical oxygen incorporation; resistivity and magnetic-field measurements then show superconducting transitions with an onset temperature of 100 K, while structural analysis confirms the infinite-layer phase.
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Using near 18,000 highly-cited publications over the past seven decades, we construct a structured knowledge graph linking competing superconducting mechanisms, material families, evidential modalities, and citation relations. We find that LLM-extracted representations recover coherent and physically interpretable structures, including family-dependent mechanism profiles, evidence-specific correlations, and citation-mediated temporal evolution of scientific beliefs. Ablation studies on LLM further show that the global structure remains robust across prompting, decoding, and model variations.
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In (La,Pr)3Ni2O7 thin films, ultra-low temperature STM/S reveals an energy-symmetric, flat-bottom U-shaped gap around the Fermi level with zero residual density of states. This gap, combined with its reduction under 14 T c-axis magnetic field and rapid filling to V-shaped with increasing temperature, matches the expected behavior of a superconducting gap, implying a nodeless gap function at ultra-low temperatures. Electrical transport on the same film shows zero resistance with Tc above 20 K, supporting the superconducting nature.
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The critical current density is strongly enhanced after the irradiation with its maximum at a dose of 1×10^16/cm², where the self-field critical current density at 2 K is enhanced from 5.5 MA/cm² to 26 MA/cm². At 77 K, the self-field critical current density for all irradiated crystals is over 0.1 MA/cm². The power-law dependence of the critical current density on the magnetic field is observed after irradiation, with a large power-law exponent α close to 1. A monotonic magnetic field dependence of the normalized magnetic relaxation rate is observed, which could be attributed to the low irreversibility field caused by the large anisotropy in Hg1223 single crystals. Through the analysis of a)
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Well-defined spin excitations at Q = (0, 0.5, 2.5) exhibit a ~5 meV gap and anisotropic dispersions with zone-boundary softening transverse to the stripe direction. The full dispersion, including pronounced bilayer-periodicity modulations, is captured by a bilayer Heisenberg Hamiltonian with strong interlayer antiferromagnetic exchange and competing in-plane couplings inside a stripe-type magnetic order. Absolute normalization of the spectra shows that the spin-wave bandwidth reaches only about 25% of cuprate values, but enhanced local dynamic susceptibility yields a total fluctuating moment of comparable size.
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In bilayer nickelates, superconductivity occurs in SDW-free, oxygen-stoichiometric regions. Spectroscopy indicates that a ligand hole resides mainly at the inter-bilayer apical oxygen, forming a robust interlayer five-spin polaron state that serves as the ground state, while oxygen deficiency favors SDW order instead.
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The coupling of electrons and valence-flexible state of oxygen ions forms a charge-regulated interfacial layer induced by the adsorption potential, and electrons are paired by sharing the optimized interfacial structure and exchanging the adsorption mode, generating strong attraction to form Cooper pairs. The effective interaction potential between electrons is exactly derived, as well as the electron-adsorption-mode coupling strength, in which the adsorption coupling constant is up to 43.4. D-wave symmetry comes from the anisotropy of interfacial adsorption forces, the pseudo-energy gap behavior is explained, the coherence length from the one-dimensional Ginzburg-Landau equation matches the
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We introduce a randomized, symmetry-preserving cooling algorithm that requires no spectral information, using only local coupling operators to ancilla degrees of freedom with randomly sampled energy splittings to drive generic fermionic systems toward their low-energy manifold. Across all models, we observe universal cooling behavior: monotonic energy relaxation, concentration of spectral weight at low energies, and stabilization of correlated ground-state order.
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Ambient-pressure superconductivity emerges in La3Ni2O7 when grown as ultra-thin films under compressive strain from suitable substrates, paralleling the high-pressure superconductivity seen in bulk Ruddlesden-Popper nickelates.
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The finite-temperature phase diagram of the t-t' Hubbard model, obtained via thermal tensor network simulations, displays a d-wave superconducting phase on the electron-doped side but a regime of strong pair-density-wave fluctuations on the hole-doped side. The PDW state involves inter-arc pairing with net momentum near (0, π), distinct from zero-momentum dSC pairing, and these fluctuating states fill the lower portion of the pseudogap regime, possibly transitioning to charge density wave order upon cooling.
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In the non-engineered SU(4) model, charge-4e superconductivity is the primary ground state at zero temperature in the strong-coupling regime. At finite temperature, in the absence of charge-2e superconductivity, a Berezinskii-Kosterlitz-Thouless transition occurs with a universal jump in superfluid stiffness matching a charge-4e condensate, and the transition temperature increases nearly linearly with interaction strength while a pseudogap opens from strong phase fluctuations.
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The magnitude of the room-temperature “drop-effect” (weight loss of sealed reactors containing powdered LBCO or YBCO plus a crystal hydrate under a high-frequency field) depends on doping almost exactly as Tc(p) does, including a maximum near optimal doping and a clear suppression near p = 1/8.
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Epitaxial compressive strain from substrates such as SrLaAlO4 enables ambient-pressure superconductivity with Tc exceeding 40 K in bilayer La3Ni2O7 thin films (and related Pr- or Sr-doped variants), converting the high-pressure bulk discovery into a practical thin-film platform whose electronic structure, Fermi-surface topology, and pairing symmetry can now be probed and tuned at ambient pressure.
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The central discovery is a doping-controlled correlation: coherent, dispersive spin excitations—the signature of collinear double-stripe magnetic correlations with a dominant interlayer exchange SJz ≈ 44 meV—remain essentially unchanged in energy and damping across x=0 to 0.21, where the films superconduct, and collapse at x=0.38, where superconductivity is gone. The collapse is selective: the ~1.0 eV intra-atomic dd excitation is unchanged, but the ~0.4 eV bilayer eg-sector excitation (sensitive to apical-oxygen interlayer hopping) and the ~1.6 eV mixed dd/charge-transfer feature are strongly suppressed. The authors interpret this as a selective doping-induced orbital reconstruction that de
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Starting from a microscopic fermionic theory, the Cooper-channel kernel admits a universal spectral representation in terms of the time-scale density of states (TDOS) of collective decay modes, without invoking a specific bosonic mediator. A finite TDOS at vanishing relaxation rate produces a memory-dominated regime characterized by long-time kernels K(t)∼1/t and logarithmic enhancement of the retarded pairing interaction, leading to a BCS-like exponential transition scale set by infrared spectral weight. More generally, infrared-singular spectra generate power-law response and algebraic enhancement of the transition scale. The same relaxation spectrum controls normal-state dynamics, giving
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The paper's central claim is that the cuprate Tc–p dome is a composite of two extrinsic suppression mechanisms imposed on a simple intrinsic law. In a clean CuO2 plane, Tc should follow the Bose–Einstein condensation temperature of preformed pairs, rising linearly with the mobile hole concentration p; the pairing glue is the antiferromagnetic background, and the Cooper pair is a d-wave singlet formed either between hole-doped composite singlets (underdoped, BEC side) or between band-like d holes (overdoped, BCS side). The parabolic dome and the supposedly universal optimal doping p = 0.16 are artifacts of randomness: random block-layer charges trap holes at low doping and cause pair breaking
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The central claim is that the newly observed splitting of the 45 meV mode together with the 60 meV feature in the doped compounds is consistent with an enhanced interlayer coupling SJ⊥ of roughly 69-73 meV within the stripe-type Heisenberg model, while the intralayer couplings remain weak; the Nd-doped sample exhibits stronger fluctuations than either the undoped or Pr-doped material.
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The paper's central claim is that the indirect attraction between two h+-Cu-h+ Cooper pairs, mediated by the oxygen anion that sits between them (bridge-II), overcomes their direct Coulomb repulsion. At the superconducting transition, this net attraction makes the preformed pairs 'hold hands' across the CuO2 plane and undergo Bose-Einstein condensation. The quantitative content is Eq. (3): Tc = Tc0 (1 - 3.426 a/λ0), so Tc increases linearly as the pair-pair scattering length a becomes more negative. The same double-bridge logic is extended to electron pairs, to nickelates, and to other strongly ionic superconductors, making the proposal a universal route rather than a cuprate-specific fix.
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The central claim is that the Josephson diode effect (JDE) in a planar s-d-s junction arises when asymmetric s-d couplings pin the stronger interface phase to φ2 = π/2, spontaneously breaking time-reversal symmetry, and when single-Cooper-pair tunneling is enabled at the weakly coupled interface. The resulting 1D potential, E(φ1) = E_J1^(2) cos2φ1 + E_J1^(1) cosφ1 ± E_Js^(1) sinφ1, contains coexisting cosφ1 and sinφ1 terms that break all Z2 symmetries and yield unequal forward and backward critical currents. The maximal diode efficiency approaches 1/3, and its polarity reverses across a critical angle θc; with zero s-wave admixture (Δds = 0), θc = π/4, while Δds > 0 shifts θc below π/4 and Δ
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In optimally doped La-Bi2201, spatially resolved transient reflectivity measurements show that micrometer-scale contrasts arise from local variations in the threshold fluence to disrupt the superconducting or pseudogap state. The superconducting response is spatially uniform while the pseudogap is inhomogeneous, yet their threshold fluences closely track each other, providing direct spatial evidence of a robust local correlation between the two states.
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In La4Ni3O10, ligand holes reside in the p_x,y orbitals of planar oxygen and the p_z orbitals of apical oxygen, hybridizing respectively with the Ni d_x2-y2 and d_z2 orbitals. This hybridization enables orbital-selective O K-edge RIXS, which demonstrates that d_x2-y2 states dominate low-energy charge excitations and are more itinerant than d_z2 states. The observation of a ~0.1 eV bimagnon in both RIXS and Raman spectroscopy indicates an interlayer superexchange interaction J_z of ~50 meV.
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The central claim is that a 3D network of boron-doped, zeolite-confined (2,1) carbon nanotubes undergoes a transition into a phase-coherent superconducting condensate at ambient pressure near 230 K. Boron doping positions the Fermi level close to a van Hove singularity, enhancing the density of states; the zeolite's ~5 Å channels stabilize (2,1) tubes that are otherwise dynamically unstable. Four complementary probes—DC magnetization, specific heat, two-probe resistance, and point-contact spectroscopy (three gaps, leading gap ~30 meV, BTK fits, tunable between tunnelling and Andreev limits)—yield mutually consistent Tc values in the range 220–250 K, with a resistive onset near 278 K and an e
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The paper's central claim is stated in the introduction: the layers in multilayer nickelates are strongly coupled, indicating that superconductivity arises collectively in the multilayers. This distinguishes them from multilayer cuprates, where superconductivity primarily resides within individual CuO2 planes that are only weakly coupled. The review uses this lens to organize the field, from the 3d9 infinite-layer LaNiO2 (Tc up to ~40 K) to the pressure-induced superconductivity of the bilayer La3Ni2O7 (onset ~80 K in bulk, ~48 K in thin films) and trilayer La4Ni3O10 (~30–40 K). Along the way it cites bulk diamagnetic shielding above 90% in pressurized La2PrNi2O7 as the strongest evidence th
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The central claim is that all three generally recognized prerequisites for high-temperature superconductivity — a high density of states at the Fermi level, strong coupling of electrons to another degree of freedom, and tunability — are present in the surface Fermi arcs of t-PtBi2. On the decorated-honeycomb (DH) termination, the arc dispersion contains a type-I van Hove singularity whose logarithmic density of states is measured about 5–8 meV below the Fermi level. On the Kagome-type (KT) termination, the arc center shows a splitting into two branches with a nearly flat lower branch and a Fermi-velocity renormalization factor of about 2.5, attributed to strong momentum-dependent coupling to
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In Section V, the authors state: 'strong-coupling d-wave high-Tc superconductivity emerges from the cooperative action of spin and charge channels.' If the paper is correct, the BS-equation theory with AL vertex corrections produces an attractive charge-channel interaction whose divergence at the bond-order QCP drives enhanced quasiparticle mass and a d-wave pairing eigenvalue, yielding T_SC and Hc2 peaks near p=0.18 to 0.2, comparable to LSCO-like cuprates.
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The abstract states that 'the geometry of lattice and charge complex heterogeneity at nanoscale is essential and intrinsic in the mechanism of rising quantum coherence at high temperature.' Section 2 further asserts that 'Euclidean Q-balls... serve as the model of nanoscale lattice heterostructure driving superconducting properties of high-Tc cuprates.' If the paper is correct, nanoscale striped and tunneling structures are a necessary ingredient for high-temperature superconductivity, and any complete theory must include them.
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The paper's discovery is that a wedge-shaped stack of intrinsic Josephson junctions in BSCCO rectifies supercurrent without any twist or artificial barrier. The diode effect is controlled by the out-of-plane component of the magnetic field, not the in-plane component, and it disappears in the model when the current-phase relation is purely sinusoidal: only the anharmonicity $\kappa$, which is large because the junction barrier is one atomic layer thick, turns field-induced symmetry breaking into $I_{c+} \neq |I_{c-}|$. The paper establishes the junction-number rule $i = \sin[\frac{1}{N}(\phi - \frac{2e}{\hbar}\int \vec A \cdot d\vec l - \kappa i)]$, verifying experimentally that fewer juncti
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The central claim is that 4.6 degree twisted WSe2 exhibits a cuprate-like phase diagram around one hole per moiré cell, with an antiferromagnetic insulator at that filling, superconducting domes on both electron and hole doping, and strange-metal behavior, and that superconductivity appears only near the gate-tuned Mott transition, supporting the strong-correlation (non-phonon) mechanism for high-temperature superconductivity.
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In (Cu,C)Ba2Ca3Cu4O11+δ, ARPES measurements show that the outer CuO2 planes are not superconducting at the material's Tc of 110 K. The inner underdoped CuO2 planes instead exhibit large pairing strength and phase coherence at a doping level of 0.07 holes per Cu. These observations establish that high Tc is primarily driven by the inner planes and that CuO2 planes free of apical oxygen can support superconductivity up to 110 K in the deep underdoped regime. The findings indicate that the composite picture of strong proximity effects between inner and outer planes is not universally required for high Tc in multilayer cuprates.
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On its own terms, the paper's central claim is that Fm-3m-LaH10 — the hydrogen-rich lanthanum superhydride with a face-centered cubic structure that superconducts near 250 K — does not decompose on a timescale of months or years under the conditions used to synthesize it. The evidence is longitudinal: for one sample, X-ray diffraction one week and 55 months after synthesis shows the same Fm-3m phase with lattice parameters within 0.5%, and resistance at 34 months gives a superconducting transition near 247 K; for a second sample, resistance measurements 2 days, 8 months, and 66 months after synthesis all show a transition near 250 K, with X-ray diffraction about one month after synthesis confirming the Fm-3m phase. A sample decompressed to 120 GPa distorted structurally and lost its high Tc, but recompression to 136 GPa restored Tc around 241 K, showing that the phase is robust over a pressure range rather than being a transient product. The paper further argues that the earlier NMR-based decomposition study never structurally characterized its samples and that its resistance data show transitions well below the ~250 K signature of Fm-3m-LaH10, so the proposed decomposition scenario likely refers to a different material.
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The central claim is that the phases observed in cuprates and related materials should be understood as intertwined orders: the charge-density wave, spin-density wave, nematic, and $d$-wave superconducting states are related by symmetry to a common “mother” state, the pair-density wave, a superconductor in which the pairing amplitude modulates with a period of a few lattice constants. In the proposed Landau–Ginzburg theory, the PDW is described by two complex order parameters $\Delta_{\pm Q}$; from them the charge order $\rho_{2Q}\sim\Delta_{-Q}^*\Delta_Q$ and a charge-$4e$ condensate $\Delta_{4e}\sim\Delta_Q\Delta_{-Q}$ follow as induced composite orders. The argument explains the anomalous dynamical layer decoupling in La$_{2-x}$Ba$_x$CuO$_4$ at $x=1/8$, predicts half-vortices carrying half the usual flux quantum ($hc/4e$), and shows that in two dimensions thermal melting of the PDW produces vestigial CDW, nematic, and charge-$4e$ phases without fine-tuning. The paper concludes that many of the observed phases in these materials may arise from a common origin and from the same microscopic physics.
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The paper's central discovery is that electronic nematicity—the spontaneous breaking of in-plane fourfold (C4) rotational symmetry down to twofold (C2) symmetry—exists in an electron-doped cuprate superconductor, Sr$_{0.9}$La$_{0.1}$CuO$_2$, and that it pervades both the normal state and the state reached when superconductivity is extinguished by a magnetic field. Using angle-resolved resistivity measurements with a cross-shaped device that rotates the current direction continuously, the authors find that the longitudinal resistivity oscillates as $\overline{\rho} + \Delta\rho\cos[2(\phi-\alpha)]$ and the transverse resistivity as $\Delta\rho\sin[2(\phi-\alpha)]$, giving a nematic amplitude $N = \Delta\rho/\overline{\rho}$ of about 1.5% at 300 K and a director $\alpha$ that shifts with temperature and rotates abruptly near $T_c$. The nematic amplitude is not changed when the substrate is switched from tetragonal KTaO$_3$(001) (in-plane lattice orthorhombicity below 0.05%) to orthorhombic GdScO$_3$(110) (film orthorhombicity 0.38%), while the director is pinned by the orthorhombic strain; the authors take this near-independence of amplitude as proof that the nematicity is electronic in origin. When a magnetic field of up to 16 T suppresses superconductivity at low temperature, the normal-state nematic amplitude and director are recovered at all temperatures below $T_c$, so the zero-temperature ground state is nematic. The nematicity also grows as the effective doping is reduced from optimal to underdoped, closely paralleling the behavior previously reported in hole-doped LSCO.
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The central claim is that in (Hg,Re)1223, the superconducting gap of the outer CuO2 plane is substantially larger than in optimally doped Bi2223, while the inner-plane gap is comparable: 'the superconducting gap for the OP was significantly larger than that of the Bi-based one' and 'the enhanced pairing energy in the OP is essential for the highest Tc at ambient pressure' (abstract). Quantitatively, the paper reports Delta0(OP) = 57 +/- 1 meV versus about 43 meV for Bi2223, and Delta0(IP) = 63 +/- 3 meV, comparable to Bi2223's roughly 60 meV.
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The paper's central claim is that a 380 mm 'Magic Box' magnetostatic cavity can house a $^{3}$He spin filter with a field-gradient contribution to the longitudinal relaxation time of at least 421 h in ambient conditions, derived from a measured total relaxation time of 130 h and a wall relaxation time of 238 h at 0.9 bar; simulations predicted 615 h for the optimized geometry, and even with a 2.1 T high-temperature superconducting magnet at the sample position the field-gradient relaxation time remains 124 h. The second central claim concerns cell-wall chemistry: caesium deposited on a (111) single-crystal silicon wafer and baked at 150°C for one week does not sit as a simple metallic overlayer but interacts chemically with the wafer's silicon dioxide surface, as evidenced by X-ray reflectometry features that the simple slab model (silicon substrate, SiO$2$ layer, caesium layer) fits only poorly, with a $\chi^2$ of 157. The authors present this as the first step of a systematic study of how alkali-metal coatings form and evolve under heat treatment, with the eventual aim of controlling the wall relaxation term in the $^{3}$He polarization decay.
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The paper reports the creation and public release of a collaborative database at https://sc.hi-scale.grisenergia.pt/app whose purpose is to consolidate the material data needed to engineer high-temperature superconducting (HTS) devices. Its central claim is that this is the largest publicly available collection of such data, going beyond superconductors themselves to include the structural, cryogenic, electrical, and magnetic materials an HTS device integrates. Every entry is meant to be traceable to a peer-reviewed source or validated manufacturer data, tagged with DOIs where possible, and structured through an ontology-driven JSON data model so the categories and properties can be extended without rebuilding the system. The authors position the database not as a static archive but as a peer-reviewed community resource whose contribution pipeline keeps it current.
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We identify emergent spectral features on both occupied and unoccupied states that are consistent with excitations driven by quantum charge fluctuations. The results obtained in this study offer direct experimental insight into charge fluctuations in cuprates, thereby paving the way towards clarifying their fine electronic structure and the mechanism of high-Tc superconductivity.
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The low-energy electronic phenomenology is dominated by oxygen-centered planar orbitals, which evolve from the d_3x2-r2 and d_3y2-r2 symmetry characteristic of 3-spin polarons to the familiar d_x2-y2 Zhang-Rice singlets that support high-temperature superconductivity in cuprates. By inclusion of magnetic moments on plaquettes of oxygen orbitals in the model, ZRS-like states mediate the SDW. Combined with the observation that oxygen annealing is required to induce superconductivity, this demonstrates that the ZRS population dictates whether the ground state favors density-wave order or superconductivity, with hole doping suppressing the former and stabilizing the latter.
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The paper's central claim is that the temperature dependence of the BSCCO-induced NV relaxation rate $\Gamma_1(T)$ at zero field is a direct readout of three distinct low-energy dynamical regimes in a thin-film cuprate. At $T \ll T_c$, $\Gamma_1 \propto T^2$, consistent with nodal d-wave quasiparticles at BCS mean-field level. Near $T_c \approx 90$ K, $\Gamma_1$ rises in a sharp symmetric peak that scales as $|T-T_c|^{-x}$ with $x \approx 1$, clearly distinct from the BCS prediction $x = 1/2$; the paper attributes this extra singularity to amplitude and phase fluctuations of the superconducting order parameter. A TDGL Langevin equation with Gaussian white noise, treated with mean-field exponents $\nu = 1/2$, $z = 2$, reproduces the divergence on both the metallic and superconducting sides and yields fitted relaxation-time ratios $\tau^{\rm fit}_{\rm M}/\tau_{\rm GL} \approx 1.2$ and $\tau^{\rm fit}_{\rm SC}/\tau_{\rm GL} \approx 0.2$, bracketing the analytical weak-coupling values $1$ and $0.5$. In an applied field the transition peak broadens and becomes asymmetric as vortices enter, with $\Gamma_1 \propto H$ as expected for a diffusive vortex liquid; $T_2$ noise spectroscopy additionally resolves MHz-frequency fluctuations assigned to vortex motion in the vortex solid deep below $T_c$.
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The authors claim that annealing as-grown La3Ni2O7 single crystals in ~10 MPa oxygen at 500 °C for about 12 hours produces a zero-field-cooled magnetization drop near 80 K, which they interpret as the Meissner effect of a superconducting transition at ambient pressure. The crystals show no zero resistance; instead, resistivity falls by about 30% between 80 and 20 K and then plateaus, consistent with small superconducting islands. The estimated superconducting volume fraction is at most 0.2%, and the signal is suppressed by fields up to 1 T without shifting the transition temperature. The authors attribute the effect to filamentary superconductivity, likely localized at boundaries of micrometer-scale domains of a nanoscale stripe phase, where residual strain mimics the effect of external pressure, and they propose that high-pressure oxygen annealing reduces oxygen vacancies, especially at the inner apical oxygen site, that otherwise suppress superconductivity.
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On its own terms, the paper claims that the LSMO/YBCO heterostructure is "a unique case of overdoped YBCO keeping Cu-O chains and Cu-O planes intact." The core-level spectra of the bilayer shift uniformly by about 0.6 eV toward the Fermi level relative to bare YBCO, the spectral weight at the Fermi level is significantly enhanced, and a fit of the Cu 2p spectra with a cluster model gives a larger satellite-to-main intensity ratio and a larger density of delocalized ligand holes, which the authors interpret as an increase in the Cu 3d hole content of the Cu-O planes. That increase in hole concentration, without any change in oxygen content or lattice structure, is the overdoping claim. The paper also reports that the bilayer remains superconducting with $T_c \approx 86$ K, about 3 K lower than the bare YBCO film.
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The paper's central claim is that in the range of parameters where high-temperature superconductivity arises, stripe ordering tendencies of some sort appear to be more or less ubiquitous. The supporting case is comparative: DMRG studies on Hubbard and t-J cylinders of width 2 to 8 find stripe or CDW-dominated ground states over broad parameter ranges, especially for t' ≤ 0; finite-temperature DQMC finds fluctuating stripe order in the normal state; and resonant X-ray and STM experiments report unidirectional CDW correlations in multiple cuprate families, strongest near x = 1/8 and always in competition with d-wave superconductivity. The authors argue these stripes arise from local phase separation in a doped Mott insulator rather than from Fermi-surface nesting. They also stress that weak X-ray intensities imply only small lattice displacements and hence do not measure the electronic condensation energy, leaving open whether the CDW is central or peripheral.
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On the paper's own terms, the central discovery is that the cubic 216-type hydride Li2AuH6, isostructural to Mg2IrH6, is dynamically stable at ambient pressure, thermodynamically metastable (38 meV/atom above the 6LiH + 5Au reactant mixture, below the 80 meV/atom empirical threshold), and has superconducting transition temperature $T_c \approx 140$ K with electron-phonon coupling constant $\lambda = 2.84$ from anisotropic Eliashberg calculations. The Au-H octahedra provide a breathing $E_g$ mode at $\Gamma$ near 140 meV, but the largest contribution (about 70% of total $\lambda$) comes from low-frequency $A_{1g}$ and $E_g$ modes at the X point in which Li atoms vibrate together with H atoms. The authors conclude that strong electron-phonon coupling can arise without metallic covalent bonds, and they propose 'BCS superconducting units'—strongly coupled phonon modes—as the design target for high-$T_c$ conventional superconductors.
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The central claim is that a bilayer two-orbital Hubbard model for La3Ni2O7, studied at the physical electron count N = 3, develops strong orbital-selective correlations because it sits close to a Mott transition at half filling N = 4. In this regime the z2 electrons are nearly localized and form interlayer spin singlets; the associated superexchange term, rewritten in the singlet channel and treated at saddle-point level, produces an additional splitting between the bonding and antibonding z2 bands. As a result the bonding–antibonding splitting remains sizable at about 1 eV even though the overall bandwidth is strongly renormalized. The paper states that this explains all four key features seen in ARPES and optical conductivity, and that the resulting picture provides the basis for a multiorbital t–J model of superconductivity in the bilayer nickelates.
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Quenched disorder in these bulk crystals drives a quantum Griffiths singularity at the superconductor-metal transition, producing a divergent dynamical critical exponent that violates conventional scaling; the effect occurs for both perpendicular and parallel field orientations and persists to 5.3 K, allowing construction of a full quantum phase diagram for the three-dimensional anisotropic case.
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Numerical simulations demonstrate that the superconducting critical temperature in the Su-Schrieffer-Heeger electron-phonon coupling model exceeds that of the Holstein model, particularly in the strong-coupling regime. This enhancement arises because SSH phonons not only induce strong electron pairing but also facilitate the phase coherence of Cooper pairs.
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A suspended niobium sheet perforated with a periodic array of through-holes, originally fabricated to engineer its phonon spectrum, is reported to lose its electrical resistance at 175 K on cooling and to remain resistance-free up to 290 K on warming. The author argues that during processing the holey niobium has partially oxidized into a niobium–oxygen square lattice geometrically analogous to the copper–oxygen plane of cuprate superconductors, and that this Nb–O plane is the actual superconducting subsystem. Beyond zero resistance, the sample is reported to show a magnetization drop on cooling (Meissner effect) and a remnant magnetization at 300 K, which the author takes as together satisf
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The central claim is that experimental signatures reported in the referenced PNAS paper constitute evidence for vestigial nematic order that originates from local symmetry breaking in the cuprate pseudogap phase.
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Superconductivity of high temperature cuprates is induced by the strong on-site Coulomb interaction, that is, the origin of high-temperature superconductivity is the strong electron correlation. Results on the ground state of electronic models for high temperature cuprates on the basis of the optimization variational Monte Carlo method show that a high-temperature superconducting phase will exist in the strongly correlated region.
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The phenomenon of superconductivity occurs in the phase space of three principal parameters: temperature T, magnetic field B, and current density Jd. A seldom-measured parameter, the depairing current density Jd, holds the same fundamental importance as Tc and Bc2, in that it defines a boundary between the superconducting and normal states. A study of Jd sheds unique light on other important characteristics of the superconducting state such as the superfluid density and the nature of the normal state below Tc.
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Using a local real-space microscopy probe, evidence is found of nanoscale interlayer defects along the c-crystallographic direction in BaFe2As2 based iron-arsenide superconductors. Ordered 122 atomic arrangements exist within the ab-plane and within regions of ~10 to 20 nm size perpendicular to this plane. While the FeAs substructure is very rigid, Ba ions are relatively weakly bound and can be displaced from the 122, forming stacking faults resulting in the physical separation of the 122 between adjacent ordered domains. The Cooper pairs may be finding a way around such localized interlayer defects through a percolative path of the ordered layered 122 lattice that may not affect Tc.
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Helium ion beam irradiation of YBa2Cu3O7 produces Josephson junctions whose transport properties vary systematically with dose, crossing from SNS to SIS behavior, while series arrays of twenty such junctions exhibit identical critical currents and resistances with no appreciable device-to-device variation.