Yang Chih-Kai, Lee Chi-Hsuan
Graduate Institute of Applied Physics, National Chengchi University, Taipei, Taiwan, Republic of China.
Sci Rep. 2023 Aug 26;13(1):13995. doi: 10.1038/s41598-023-41376-y.
UTe is one triplet superconductor that defies conventional relation between ferromagnetism and superconductivity. Our search for a theoretical explanation starts with one spin-triplet state of two electrons and construct a two-particle exchange interaction that favors the formation of Cooper pairs under the configuration. A modified application of the Bardeen-Cooper-Schrieffer (BCS) theory using parameters derived from ab-initio density functional calculations for electrons and phonons enables us to derive the critical temperature of 1.64 K and an average superconducting gap of 0.25 meV at 0 K. We extend the investigation further into the superconductivity under pressure, showing how T and the gap of UTe change under compression in ways that are consistent with the results of experiment.
UTe是一种违背铁磁性与超导性之间传统关系的三重态超导体。我们对理论解释的探索始于两个电子的一种自旋三重态，并构建了一种双粒子交换相互作用，该相互作用有利于在这种构型下形成库珀对。使用从电子和声子的从头算密度泛函计算得出的参数对巴丁 - 库珀 - 施里弗（BCS）理论进行修正应用，使我们能够推导出1.64 K的临界温度以及在0 K时0.25 meV的平均超导能隙。我们进一步将研究扩展到压力下的超导性，展示了UTe的临界温度和能隙在压缩时如何以与实验结果一致的方式变化。
