Sakakibara Hirofumi, Usui Hidetomo, Suzuki Katsuhiro, Kotani Takao, Aoki Hideo, Kuroki Kazuhiko
Department of Applied Mathematics and Physics, Tottori University, Tottori, Tottori 680-8552, Japan.
Advanced Mechanical and Electronic System Research Center(AMES), Tottori University, Tottori, Tottori 680-8552, Japan.
Phys Rev Lett. 2020 Aug 14;125(7):077003. doi: 10.1103/PhysRevLett.125.077003.
Effective models are constructed for a newly discovered superconductor (Nd,Sr)NiO_{2}, 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 d_{x^{2}-y^{2}}-wave superconductivity, where the transition temperature should be lowered from the cuprates due to the larger interaction.
针对新发现的超导体（Nd，Sr）NiO₂构建了有效模型，该超导体被认为可能是铜酸盐的镍酸盐类似物。对有效相互作用的估计表明，其有效相互作用明显大于铜酸盐中的情况，结果发现这需要一个考虑费米面上所有相关轨道的多轨道模型。涨落交换研究表明存在dx²-y²波超导性，由于相互作用较大，其转变温度应低于铜酸盐中的转变温度。
