Electron-phonon coupling in La3In under pressure

Surinder Singh; Udomsilp Pinsook

doi:10.1088/1361-648X/acc4fe

Electron-phonon coupling in La₃In under pressure

J Phys Condens Matter. 2023 Apr 3;35(24). doi: 10.1088/1361-648X/acc4fe.

Authors

Surinder Singh¹, Udomsilp Pinsook¹

Affiliation

¹ Department of Physics, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand.

PMID: 36927624
DOI: 10.1088/1361-648X/acc4fe

Abstract

Conventional superconducting parameters Eliashberg spectral function, phonon DOS, average electron-phonon coupling constant & superconducting transition temperature of La₃In 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 × 10^-3eV. Phonon dispersion relations for the ambient and applied positive hydrostatic pressure were calculated to confirm the dynamical stability of La₃In 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 La₃In was also studied.

Keywords: Eliashberg–Migdal formalism; conventional superconductivity; electron-phonon coupling; positive hydrostatic pressure; spin–orbit coupling.