Pairing gap from repulsion scales as ℓ
Zero-sound resummation of the Kohn anomaly makes high-partial-wave pairing exponentially stronger.
cond-mat.supr-con
Superconductivity
Superconductivity: theory, models, experiment. Superflow in helium
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This paper studies dense quark matter where quarks pair into spin-one Cooper pairs
In spin-one color superconductors, the topological node count is set by a generalized pairing monopole charge that includes color Berry…
The γ band pulls ferromagnetic
Without the δ band the pairing flips to d-wave, explaining why calculations disagree.
Why Ti4Ir2O beats the Pauli limit
Spin-orbit-locked electrons near the X points barely feel magnetic fields, boosting superconductivity past the usual ceiling.
· “Large critical fields in superconducting Ti₄Ir₂O from spin-orbit coupling”
181 K superconductivity predicted in Be-actinium hydride at 10 GPa
If the prediction holds, hydride superconductors could work at roughly 10 GPa instead of 150-300 GPa.
· “Prediction of high-Tc superconductivity in ternary actinium beryllium hydrides at low pressure”
Nematic temperature crosses zero at optimal cobalt doping
The Curie-Weiss fit puts a nematic quantum critical point beneath the superconducting dome in LaFe1-xCoxAsO.
· “Evolution of the nematic susceptibility in LaFe_(1-x)Co_xAsO”
Bulk s-wave pairing meets hourglass topology in TiIrGe and HfIrGe
The compounds' helical surface states could host topological superconductivity without doping or interface engineering.
· “Topological superconductivity in hourglass Dirac chain metals (Ti, Hf)IrGe”
Echo peak pins elastic-to-inelastic ratio in disordered bosons
Ties the echo's shape to the elastic-inelastic self-energy ratio and says quantum fluctuations block perfect rephasing.
· “Two-dimensional spectroscopy of bosonic collective excitations in disordered many-body systems”
A sharp Raman peak could expose pair-density-wave order
In mixed PDW+superconductor phases, one Higgs mode sharpens into a nearly delta-function peak, a unique Raman fingerprint.
· “Time-reversal symmetry breaking, collective modes, and Raman spectrum in pair-density-wave states”
NiFeCr suppresses π-junction supercurrent by two orders of magnitude
The alloy's 0.36 nm decay length and high resistivity rule it out for cryogenic memory.
· “Comparison of NiFeCr and NiFe in ferromagnetic Josephson junctions”
Cold substrates shift the superconducting dome of granular aluminum
The same Tc dome survives from 300 K down to 25 K, but cold growth needs faster evaporation and leaner oxygen to keep high-resistivity…
Tungsten diboride predicted to combine hardness with ductility
First-principles calculations put WB2 on the ductile side; CrB2 and MoB2 stay brittle.
Tunable Josephson devices reach internal Q factors above 100,000
A refined surface treatment cuts loss in parametric amplifiers and converters, lifting squeezed-state purity near 99 percent.
Driven circuit makes a self-correcting GKP qubit
Simulations show bandpass-filter sideband cooling stabilizes the code space at ~100 mK.
· “Self-correcting GKP qubit in a superconducting circuit with an oscillating voltage bias”
Kibble-Zurek scaling survives in chiral 3He films
Simulations find freeze-out exponent 0.436; vortex-count moments deviate slightly from independent-defect models.
· “Kibble-Zurek Dynamics & Statistics of Topological Defects in Chiral Superfluid ³He Films”
In FeSe's nematic phase, c-axis field lowers c-axis resistance
The drop reaches roughly 15% at 10 K and 16 T, implicating spin-fluctuation scattering.
Magic-angle superconductivity collapses under Coulomb screening
Doping a nearby twisted bilayer cuts the critical temperature by more than an order of magnitude, evidence for electronic pairing.
· “Coulomb screening of superconductivity in magic-angle twisted bilayer graphene”
AcBH7 predicted to superconduct at 122 K under 70 GPa
The actinium borohydride would match LaBeH8 and LaB2H8, two ternary hydrides already made below megabar pressure.
· “Prediction of high-Tc superconductivity under submegabar pressure in ternary actinium borohydrides”
A quantum dot rectifies supercurrents up to 72 percent
In an interacting chiral dot, spin-density imbalance lets forward and reverse supercurrents differ.
· “Field-free Josephson diode effect in interacting chiral quantum dot junctions”
Same alloy in two roles widens spin-valve window to 0.6 K
Half-metal and weak-ferromagnet layers made from one Heusler alloy boost the triplet effect past 1 K.
· “Expanding the operational temperature window of a superconducting spin valve”
Spin fluctuations cap predicted Tc of doped KMgH3 at 7.6 K
Phonon-only theory gives 38.7 K at the best-doped point; including spin fluctuations collapses it to 4.4 K.
A 0.2 T in-plane field flips PdBi2 into p-wave pairing
Tunnelling spectra reveal a sharp in-field transition inside the superconducting state — a rare pairing-symmetry switch.
Plasmons can glue Cooper pairs in magic-angle graphene
A purely electronic mechanism predicts the asymmetrical superconducting dome and few-kelvin critical temperature seen in experiments.
· “Superconductivity from collective excitations in magic angle twisted bilayer graphene”
Hund's metal correlations boost superconductivity
Spectral weight piled near the Fermi energy pairs with the bosonic glue, preserving gaps even at strong repulsion.
· “Synergy between Hund-driven correlations and boson-mediated Superconductivity”
Two-band superconductors damp gap oscillations as t^-3/2
Inter-band dephasing accelerates collisionless relaxation and produces two-frequency beating in materials like MgB2 and iron pnictides.
FeSe nonreciprocal signal traced to contact Joule heating
Swapping current and voltage contacts flips the second-harmonic signal, matching a thermoelectric artifact.
Equation predicts the field that suppresses superconductivity
Cooper pairs as hydrogen-like bound states plus screened-field averaging match the measured 10^8 V/m threshold in NbN films.
Interlayer repulsion flips nickelate pairing to dxy-wave
Turning on interlayer Coulomb repulsion switches the leading gap from nodeless s±-wave to nodal dxy-wave.
· “Interlayer interactions in La₃Ni₂O₇ under pressure: from s^(pm) to d_(xy)-wave superconductivity”
Higgs mode can destabilize current-carrying dirty superconductors
New conductivity formula predicts a frequency window with negative superfluid density and a near-100x kinetic inductance boost.
Mixed-symmetry superconductivity leaves multi-peak tunneling spectra
In a 2D Hubbard model, pure d-wave order transforms into s+d+ip below Tc and splits the DOS peaks.
First Josephson coupling found in lanthanum cuprate superlattice
Ten alternating LCO/LSCO layers form an overdamped Josephson stack with a 20 nA critical current at 12 mK.
· “Josephson coupling in Lanthanum-based cuprates superlattices”
Orbital origins of kagome superconductor's exotic states revealed
QPI maps tie hidden order to V out-of-plane orbitals and pseudogap to Sb pz electrons.
Nano-holes lift aluminum film's transition temperature by up to 6%
Periodic patterning softens phonons and boosts high-energy pairing, making geometry a design knob for superconductors.
Orbital fluctuations may shape nickelate's weak-insulator state
A two-orbital model of La3Ni2O7 finds the strongest orbital response at (π/2, π/2), a candidate driver of the weak insulator.
· “Orbital correlations in bilayer nickelates: roles of doping and interlayer coupling”
Magnetic underlayer overdopes YBCO without changing its structure
Core-level shifts and added Fermi-level weight point to hole transfer across the interface.
· “Overdoping YBa2Cu3O7 via a heterostructure with La0.67Sr0.33MnO3”
NN repulsion shrinks d-wave pairing in electron-doped cuprates
A repulsive nearest-neighbor interaction suppresses d-wave pairing and favors d_xy-wave pairing instead.
· “Pairing phase diagram for electron-doped cuprates in the square-lattice t-U-V Hubbard model”
Reanalysis: Sr2RuO4 muon data fit T2
Old and new μSR spectra agree once analyzed alike; the square vortex lattice adds a new order-parameter constraint.
1 kHz NMR linewidths mark LaRhGe3 as an unusually clean metal
The narrowest lines in a non-centrosymmetric compound signal weak correlations and support type-I superconductivity.
· “Highly Uniform Magnetic and Electronic Environment in Non-Centrosymmetric Superconductor LaRhGe₃”
Stacking CuO2 layers multiplies charge-order coupling by N
Stacking CuO2 planes turns a monolayer's coupling J into NJ, stabilizing the charge order behind the pseudogap.
· “Model for the commensurate charge-density waves in under-hole-doped cuprate superconductors”
UTe2 keeps both heavy electrons and local magnets
Clean crystals show 5f electrons split into a heavy Fermi liquid and antiferromagnetic local moments down to Tc.
Short altermagnet layers create bound states and switch Josephson sign
Orientation of the d-wave spin splitting decides whether subgap spikes or 0-pi transitions appear.
NQR finds charge and spin density waves in nickelate superconductor
Both orders appear at one transition near 153 K, linking nickelates to cuprate stripe physics.
· “Microscopic evidence of charge- and spin-density waves in La₃Ni₂O_(7-δ) revealed by ¹³⁹La-NQR”
Faint spin branch in cuprate ladder reveals strong hole pairing
A nearest-neighbor attraction of about -1t to -1.25t boosts d-wave-like pairing by nearly an order of magnitude.
Point-contact spectra reveal surface flat bands in Sn0.15NbSe1.75
Asymmetric conductance peaks close at 23 K and open a pseudogap at 6.8 K, evidence for drumhead surface states.
Pressure revives superconductivity inside 1T'-WS2's Hall state
A higher-pressure superconducting phase with distinct anisotropy hints at unconventional pairing.
· “Tunable superconductivity coexisting with the anomalous Hall effect in 1T'-WS2”
Spin-split interaction drives Lifshitz transition and p-wave pairing
Nearest-neighbor spin-polarized interaction triggers a Lifshitz transition and equal-spin triplet p-wave pairing.
500-nm circuits patterned onto diamond anvil tips
New lift-off recipe lays durable leads that survive 51 GPa and cryogenic temperatures for high-pressure quantum measurements.
· “Sub-micron Circuit Fabrication on Diamond Anvils for Mesoscopic High-Pressure Experiments”
Euler topology leaves a quantized jump in superconductor optics
Optical conductivity jumps by e²/16ℏ at twice the pairing gap when Euler bands pair in a d-wave channel.
Sputtering current lifts Ti40V60 film's transition from 2.6 K to 5.3 K
Room-temperature deposition tunes grain size and texture, pushing Ti40V60 films toward bulk superconductivity without annealing.
Hydride superconductivity's magnetic evidence is a background artifact
A raw-data comparison suggests the 2015 diamagnetic signal was pressure-cell background.
· “Hydride superconductivity: here to stay, or to lead astray and soon go away?”
Al13Os4: a 5.47 K superconductor with nontrivial Z2 topology
Bulk BCS superconductor and predicted topological metal make it a platform for topological superconductivity in quasicrystals.
· “Observation of superconductivity in a nontrivial mathcal{Z}₂ approximant quasicrystal”
Heated sodium azide yields polymeric nitrogen at ambient pressure
Recrystallized sodium azide heated to 240-260 C shows the 635 cm-1 Raman fingerprint of cubic gauche nitrogen.
SQUID scans find nodeless gaps in all three Kagome superconductors
Low-temperature penetration depth rules out nodal pairing and pairs KV3Sb5 with RbV3Sb5, not CsV3Sb5.
· “Direct Comparison of Magnetic Penetration Depth in Kagome Superconductors AV₃Sb₅ (A = Cs, K, Rb)”
Nematic fluctuations, not magnetism, drive strange-metal transport
T-linear resistivity and S/T divergence peak where nematic order ends at x=0.45.
Twin-boundary vortex splits into two half-quantum pieces
Simulations of FeSe show each trapped vortex becomes two half-quantum vortices, with a flow signature to test.
· “Fractional vortex array realized at twin boundary in a nematic superconductor”
Gaussian fluctuations dip to x≈0.83 in bilayer superconductors
Two coupled planes switch between 1 and 2 independent fluctuating layers as T/Tc varies.
Chiral double-layer quasiparticles split into edge and bulk modes
A boundary phase between the two layers switches each edge current independently, offering experimental control.
Supercurrent diode flips sign at half a flux quantum
A topological-insulator nanowire junction acts as a nano-SQUID; the sign change marks Majorana physics.
· “Tunable superconducting diode effect in a topological nano-SQUID”
Intercalant doping, not layer spacing, sets FeSe Tc
Se K-edge shows higher Tc phase carries more electrons and softer Fe-Se bonds
Alpha-tantalum circuits on silicon reach Qi above 3 million
A 100 nm film gives low loss, while a 40 nm film maximizes kinetic inductance for compact quantum circuits.
Lower Josephson plasmon is a ghost at zero c-axis momentum
The mode only appears in density probes once out-of-plane momentum grows enough to give it a longitudinal component.
Flux jumps traced to one nonlinear heating term
A 1D model shows jumps strike at pulse durations near the magnetic relaxation time, mostly at low temperature.
· “Mathematical analysis of a flux-jump model in superconductivity”
Loop currents cannot glue high-temperature superconductivity
Even-parity loop currents give no boost; odd-parity ones actively suppress Cooper pairing.
· “Unconventional Superconductivity in Correlated, Multiband, and Topological Systems”
p-wave magnets can host superconductivity at any spin splitting
A momentum shift erases the spin splitting, leaving standard BCS physics—and Andreev reflections expose it.
Pulse shape decides between Higgs and Leggett modes in MgB2
Multi-cycle THz light excites the π-band Higgs mode; single-cycle pulses drive the Leggett mode.
· “Selective excitation of collective modes in multiband superconductor MgB2”
Ferromagnetism fades exactly where superconductivity appears
Europium-to-strontium substitution in Eu1-xSrxAlSi points to a quantum critical point near x ≈ 0.96.
Shiba chain yields Majorana zero modes plus a diode effect
FFLO pairing under an out-of-plane field gives unequal critical currents, with diode efficiency up to 60%.
Bilayer splitting survives underdoping
A CNN trained on synthetic spectra reads 0.10 eV and 0.13 eV splits in optimally and underdoped BSCCO.
Casimir cavity leaves superconductor Tc unchanged to 12 microkelvin
Predicted effect is 0.025 microkelvin, so the search is roughly 1000 times shy of the target.
Coarse k-mesh fakes ferromagnetism in kagome metals
Dense sampling shows CsV3Sb5, RbV3Sb5, KV3Sb5 are nonmagnetic; spin-orbit effects stay below 20 meV.
Under 20 nm, 2M-WS2 breaks the Pauli limit
Thin flakes show an in-plane critical field far above the Pauli limit, tied to carrier density and spin-orbit-parity coupling.
· “Crossover from Conventional to Unconventional Superconductivity in 2M-WS2”
Two superconducting domes in FeSe host different Dirac states
Bulk Dirac cone and strange metal mark dome 1; a surface Dirac cone flips sign at dome 2—two pairing mechanisms.
Hall conductance shift reads out the radial Rashba angle
In-plane magnetization sweeps reveal the Rashba angle as a rigid shift, making interfacial spin textures electrical.
· “Transport Signatures of Radial Rashba Spin-Orbit Coupling at Ferromagnet/Superconductor Interfaces”
Interactions drive and quench twisted graphene superconductivity
At the magic angle, more screening shrinks the superconducting dome; at 1.4 degrees, it lets a smaller pocket appear.
· “Double-edged Role of Interactions in Superconducting Twisted Bilayer Graphene”
Supercurrent diode rectifies sideways at 100% efficiency
In a tilted Dirac junction the transverse critical currents become asymmetric, decoupling output from input.
· “Transverse Josephson diode effect in tilted Dirac systems”
Tin doping lifts a superconductor's Tc by adding a second band
Heat-capacity and band-structure data trace the jump to new Fermi pockets, not to the usual atomic-mass effect.
Simulated doping patterns lift 4.2 K bolometer range 35-fold
In constant-current mode, best overdoped design reaches dynamic range 7×10^5 versus 2×10^4 unpatterned, without SQUID readout.
· “Design of structured La_(2-x)Sr_(x)CuO₄ films as superconducting transition-edge sensors at 4.2K”
Magnetic field flips a superconductor's magnetism to incommensurate
Neutron data show the shift only for in-plane fields, tying superconductivity to commensurate order.
· “Magnetic field tuned superconducting and normal phase magnetism in CeCo_(0.5)Rh_(0.5)In₅”
Hexagonal switch gives Pb-Bi its lambda approx 2 and a three-gap state
First-principles and heat-capacity data trace the strong coupling to softened phonons, with disorder pulling Tc down.
· “Anisotropic, multiband, and strong-coupling superconductivity of the Pb0.64Bi0.36 alloy”
At 6 percent doping, an organic superconductor hits BCS-BEC crossover
Only at 6 percent hole doping does the model show Cooper pairs becoming tightly bound bosons, matching the material κ-HgBr.
· “Possibility of BCS-BEC crossover in kappa-type organic superconductors”
