s±-wave superconductivity in pressurized La4Ni3O10
Ming Zhang, Hongyi Sun, Yu-Bo Liu, Qihang Liu, Wei-Qiang Chen, Fan Yang
DOI 10.1103/PhysRevB.110.L180501 · Physical Review B
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Abstract
Recently, evidence of superconductivity (SC) has been reported in pressurized La4Ni3O10. Here we study its possible pairing mechanism and pairing symmetry. Through fitting the density-functional-theory band structure, we provide a six-orbital tight-binding model. In comparison with the band structure of La3Ni2O7, the additional nonbonding dz2 band is important to the pairing mechanism here. When the multiorbital Hubbard interactions are included, our random-phase-approximation based study yields an s±-wave SC. The dominant Fermi-surface nesting with vector Q1≈(π,π) is between the γ pocket contributed by the bonding dz2 band top and the α1 pocket contributed by the nonbonding dz2 band bottom, leading to the strongest pairing amplitude and opposite gap signs within the two regimes. The dominant real-space pairing is the interlayer dz2-orbital pairing. This s±-wave pairing pattern is insensitive to the band details. Upon electron doping, the Tc would increase promptly before the system enters the Néel-ordered spin-density-wave phase.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La4Ni3O10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30 | Pressure not reported | zero_resistance |
| La3Ni2O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 80 | Pressure not reported | onset |
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