Interlayer-Coupling-Driven High-Temperature Superconductivity in La3Ni2O7 under Pressure
Chen Lu, Zhiming Pan, Fan Yang, Congjun Wu
DOI 10.1103/PhysRevLett.132.146002 · Physical Review Letters
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Abstract
The newly discovered high-temperature superconductivity in La3Ni2O7 under pressure has attracted a great deal of attention. The essential ingredient characterizing the electronic properties is the bilayer NiO2 planes coupled by the interlayer bonding of 3dz2 orbitals through the intermediate oxygen atoms. In the strong coupling limit, the low-energy physics is described by an intralayer antiferromagnetic spin-exchange interaction J∥ between 3dx2−y2 orbitals and an interlayer one J⊥ between 3dz2 orbitals. Taking into account Hund’s rule on each site and integrating out the 3dz2 spin degree of freedom, the system reduces to a single-orbital bilayer t−J model based on the 3dx2−y2 orbital. By employing the slave-boson approach, the self-consistent equations for the bonding and pairing order parameters are solved. Near the physically relevant 14-filling regime (doping δ=0.3∼0.5), the interlayer coupling J⊥ tunes the conventional single-layer d-wave superconducting state to the s-wave one. A strong J⊥ could enhance the interlayer superconducting order, leading to a dramatically increased Tc. Interestingly, there could exist a finite regime in which an s+id state emerges.
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 |
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