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Pressure-enhanced splitting of density wave transitions in La$_3$Ni$_2$O$_{7-\delta}$
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abstract
The observation of superconductivity in La$_3$Ni$_2$O$_{7-\delta}$ under pressure, following the suppression of a high-temperature density wave state, has attracted considerable attention. The nature of this density wave order was not clearly identified. Here, we probe the magnetic response of the zero-pressure phase of La$_3$Ni$_2$O$_{7-\delta}$ as hydrostatic pressure is applied and find that the apparent single density wave transition at zero applied pressure splits into two. The comparison of our muon-spin rotation and relaxation experiments with dipole-field numerical analysis reveals the magnetic structure's compatibility with a stripe-type arrangement of Ni moments, characterized by alternating lines of magnetic moments and nonmagnetic stripes at ambient pressure. When pressure is applied, the magnetic ordering temperature increases, while the unidentified density wave transition temperature falls. Our findings reveal that the ground state of the La$_3$Ni$_2$O$_{7-\delta}$ system is characterized by the coexistence of two distinct orders -- a magnetically ordered spin density wave and a lower-temperature ordering that is most likely a charge density wave -- with a notable pressure-enhanced separation between them.
Forward citations
Cited by 7 Pith papers
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Low volume fraction of high-Tc superconductivity in La3Ni2O7 at 80 K and ambient pressure
Oxygen annealing of La3Ni2O7 single crystals produces a 0.1-0.2% volume-fraction diamagnetic signal at 80 K and ambient pressure, attributed to filamentary superconductivity.
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Pressure-tunable structural instabilities in single-layer-trilayer La$_3$Ni$_2$O$_7$
DFT phonon calculations show the P4/mmm phase of single-layer-trilayer La3Ni2O7 is unstable at all pressures up to 30 GPa, and the lowest-energy distortions combine two instabilities, contrary to experimental refinements.
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Origin of the Diagonal Double-Stripe Spin-Density-Wave and Potential Superconductivity in Bulk La$_3$Ni$_2$O$_{7}$ at Ambient Pressure
An RPA analysis of an eight-band tight-binding model for ambient-pressure La3Ni2O7 reproduces the experimentally observed unidirectional diagonal double-stripe spin-density-wave and predicts enhanced pairing under hol...
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Evolution of magnetism in Ruddlesden-Popper bilayer nickelate revealed by muon spin relaxation
Muon spin relaxation finds long-range magnetic order below 161 K in La1.9Pr1.1Ni2O6.97 and short-range order below 30 K in oxygen-deficient La3Ni2O6.63, linking oxygen vacancies to suppressed magnetism.
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Orbital correlations in bilayer nickelates: roles of doping and interlayer coupling
In a two-orbital RPA model of La3Ni2O7, transverse orbital fluctuations peak at (π/2, π/2) and sit closer to divergence than longitudinal ones, pointing to a possible orbital-fluctuation mechanism.
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Low-temperature mean valence of nickel ions in pressurized La$_3$Ni$_2$O$_7$
Nickel valence in La3Ni2O7 stays close to 2.5+ from ambient pressure to 40 GPa at 20 K, so pressure-induced superconductivity is tied to a structural transition rather than a change in nickel charge.
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Unveiling the multiband metallic nature of the normal state in nickelate La3Ni2O7
Magnetoresistance of pressurized La3Ni2O7 follows a quasi-quadratic field dependence and extended Kohler scaling, leading the authors to conclude the normal state is a multiband metal.
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