Electronic correlations and superconducting instability in La3Ni2O7 under high pressure
Frank Lechermann, Jannik Gondolf, Steffen Bötzel, Ilya M. Eremin
DOI 10.1103/PhysRevB.108.L201121 · Physical Review B
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Abstract
Motivated by the report of superconductivity in bilayer La3Ni2O7 at high pressure, we examine the interacting electrons in this system. First-principles many-body theory is utilized to study the normal-state electronic properties. Below 100 K, a multiorbital non-Fermi-liquid state resulting from a loss of Ni-ligand coherence within a flat-band-dominated low-energy landscape is uncovered. The incoherent low-temperature Fermi surface displays strong mixing between Ni−dz2 and Ni−dx2−y2 orbital character. In a model Hamiltonian picture, spin fluctuations originating mostly from the Ni−dz2 orbital give rise to strong tendencies towards a superconducting instability with a B1g or B2g order parameter. The dramatic enhancement of Tc in pressurized La3Ni2O7 is due to stronger Ni−dz2 correlations compared to those in the infinite-layer nickelates.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La3Ni2O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 80 | 14 GPa | unknown |
| NdNiO2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 15 | Pressure not reported | unknown |
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