Electron-phonon coupling in La₃In under pressure

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 6.21×10-3 eV. 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 (SOC) on electronic, phonon and superconducting properties of La3In was also studied.

Effect of pressure on superconductivity of LaBi3

“…decrease in the value of both T c and λ ep with pressure is consistent with the similar published results for YIn 3 & LaSn 3 [18,19]. However, the same is not true for the similar published results for La 3 In [20] where T c decreases but λ ep increases with pressure. The supplementary data shows the effect of Fermi-Dirac Smearing on λ ep and T c .…”