Preempted phonon-mediated superconductivity in the infinite-layer nickelates

Q. N. Meier; J. B. de Vaulx; F. Bernardini; A. S. Botana; X. Blase; V. Olevano; A. Cano

doi:10.1103/PhysRevB.109.184505

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Preempted phonon-mediated superconductivity in the infinite-layer nickelates

Q. N. Meier, J. B. de Vaulx, F. Bernardini, A. S. Botana, X. Blase, V. Olevano, A. Cano

DOI 10.1103/PhysRevB.109.184505 · Physical Review B

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Abstract

Nickelate superconductors are outstanding materials with intriguing analogies with the cuprates. These analogies suggest that their superconducting mechanism may be unconventional, although this fundamental question is currently under debate. Here, we scrutinize the role played by electronic correlations in enhancing the electron-phonon coupling in the infinite-layer nickelates and the extent to which this may promote superconductivity. Specifically, we use ab initio many-body perturbation theory to perform state-of-the-art GW and Eliashberg-theory calculations. We find that the electron-phonon coupling is effectively enhanced compared to pure density-functional-theory calculations. This enhancement may lead to low-Tc superconductivity in the parent compounds already. However, it remains marginal in the sense that it cannot explain the record Tcs obtained with doping. This circumstance implies that conventional superconductivity is preempted by another pairing mechanism in the infinite-layer nickelates.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Nd0.8Sr0.2NiO2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	20	Pressure not reported	unknown
Nd0.8Sr0.2NiO2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0	Pressure not reported	unknown
Nd0.8Sr0.2NiO2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.02	Pressure not reported	unknown
Nd0.8Sr0.2NiO2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.05	Pressure not reported	unknown
Nd0.8Sr0.2NiO2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0	Pressure not reported	unknown
NdNiO2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.02	Pressure not reported	unknown
NdNiO2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.48	Pressure not reported	unknown
NdNiO2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.67	Pressure not reported	unknown
NdNiO2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.27	Pressure not reported	unknown
LaNiO2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.01	Pressure not reported	unknown
LaNiO2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.12	Pressure not reported	unknown
LaNiO2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.25	Pressure not reported	unknown