Singh Surinder, Pinsook Udomsilp
Department of Physics, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand.
J Phys Condens Matter. 2023 Apr 3;35(24). doi: 10.1088/1361-648X/acc4fe.
Conventional superconducting parameters Eliashberg spectral function, phonon DOS, average electron-phonon coupling constant & superconducting transition temperature of LaIn were calculated at ambient and applied positive hydrostatic pressure. Ambient pressure electron-phonon coupling constant was found to be 1.43 and superconducting transition temperature was calculated to be 8.7 K which is close to the experimental reported value of 9.5 K. Logarithmic average phonon frequency at ambient pressure was found to be 6.21 × 10eV. Phonon dispersion relations for the ambient and applied positive hydrostatic pressure were calculated to confirm the dynamical stability of LaIn under positive pressure. Acoustic modes of vibrations were found to mediate most of the electron-phonon-electron interaction with a very small contribution from optical modes of vibrations. Fermi surface at ambient pressure was also calculated and employed in explaining the large value of the calculated electron-phonon coupling constant. The effect of spin-orbit coupling on electronic, phonon and superconducting properties of LaIn was also studied.
在环境压力和施加正静水压力的条件下，计算了LaIn的常规超导参数，即Eliashberg谱函数、声子态密度、平均电子-声子耦合常数和超导转变温度。发现环境压力下的电子-声子耦合常数为1.43，计算得到的超导转变温度为8.7 K，这与实验报道的9.5 K值相近。发现环境压力下的对数平均声子频率为6.21×10eV。计算了环境压力和施加正静水压力下的声子色散关系，以确认LaIn在正压力下的动力学稳定性。发现振动的声学模式介导了大部分电子-声子-电子相互作用，而振动的光学模式贡献非常小。还计算了环境压力下的费米面，并用于解释计算得到的电子-声子耦合常数的较大值。还研究了自旋-轨道耦合对LaIn的电子、声子和超导性质的影响。
