Designing nickelate superconductors with d8 configuration exploiting mixed-anion strategy
Naoya Kitamine, Masayuki Ochi, Kazuhiko Kuroki
DOI 10.1103/PhysRevResearch.2.042032 · Physical Review Research
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Abstract
Inspired by a recently proposed superconducting mechanism for a new cuprate superconductor Ba2CuO3+δ, we theoretically design an unconventional nickelate superconductor with a d8 electron configuration. Our strategy is to enlarge the on-site energy difference between 3dx2−y2 and other 3d orbitals by adopting halogens or hydrogen as out-of-plane anions, so that the 3d bands other than dx−y2 lie just below the Fermi level for the d8 configuration, acting as incipient bands that enhance superconductivity. We also discuss a possible relevance of the present proposal to the recently discovered superconductor (Nd,Sr)NiO2.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba2CuO3+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| (Nd,Sr)NiO2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| HgBa2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 100 | Pressure not reported | unknown |
| Ca2NiO2Cl2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Ca2NiO2H2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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