Magnetic correlations and pairing tendencies of the hybrid stacking nickelate superlattice La7Ni5O17 (La3Ni2O7/La4Ni3O10) under pressure
Yang Zhang, Ling-Fang Lin, Adriana Moreo, Thomas A. Maier, Elbio Dagotto
DOI 10.1103/t4zz-zbw1 · Physical Review B
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Abstract
Motivated by the recent rapid progress in high-Tc nickelate superconductors, we comprehensively study the physical properties of the alternating bilayer trilayer stacking nickelate La7Ni5O17. The high-symmetry phase of this material, without the tilting of oxygen octahedra, is not stable at ambient conditions but becomes stable under high pressure, where a small hole pocket γ0, composed of the d3z2−r2 states in the trilayer sublattice, appears. This pocket was identified in our previous work for trilayer La4Ni3O10 as important to develop superconductivity. Moreover, using random-phase approximation calculations, we find a leading s± pairing state for the high-symmetry phase under pressure with similar pairing strength as that obtained previously for the bilayer La3Ni2O7 compound, suggesting a similar or higher superconducting transition temperature Tc, at the random-phase approximation level. In addition, we find that the dominant magnetic fluctuations in the system driving this pairing state have antiferromagnetic structure both in-plane and between the planes of the top and bottom trilayer and bilayer sublattices, while the middle trilayer is magnetically decoupled.
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 |
| La4Ni3O10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 25 | 15 GPa | unknown |
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