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Sakakibara, Hirofumi; Usui, Hidetomo; Suzuki, Katsuhiro; Kotani, Takao; Aoki, Hideo; Kuroki, Kazuhiko
Physical review letters, 08/2020, Letnik: 125, Številka: 7Journal Article
Effective models are constructed for a newly discovered superconductor (Nd, Sr) NiO2, which has been considered as a possible nickelate analog of the cuprates. Estimation of the effective interaction, which turns out to require a multiorbital model that takes account of all the orbitals involved on the Fermi surface, shows that the effective interactions are significantly larger than in the cuprates. A fluctuation exchange study suggests occurrence of dx2−y2-wave superconductivity, where the transition temperature should be lowered from the cuprates due to the larger interaction.
