Optimizing Superconductivity: From Cuprates via Nickelates to Palladates
Motoharu Kitatani, Liang Si, Paul Worm, Jan M. Tomczak, Ryotaro Arita, Karsten Held
DOI 10.1103/PhysRevLett.130.166002 · Physical Review Letters
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Abstract
Motivated by cuprate and nickelate superconductors, we perform a comprehensive study of the superconducting instability in the single-band Hubbard model. We calculate the spectrum and superconducting transition temperature Tc as a function of filling and Coulomb interaction for a range of hopping parameters, using the dynamical vertex approximation. We find the sweet spot for high Tc to be at intermediate coupling, moderate Fermi surface warping, and low hole doping. Combining these results with first principles calculations, neither nickelates nor cuprates are close to this optimum within the single-band description. Instead, we identify some palladates, notably RbSr2PdO3 and A2′PdO2Cl2 (A′=Ba0.5La0.5), to be virtually optimal, while others, such as NdPdO2, are too weakly correlated.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| NdNiO2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30 | 12 GPa | unknown |
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