Low-energy phonons and superconductivity in Sn${}_{0.8}$In${}_{0.2}$Te

Abstract

We present neutron scattering measurements on low-energy phonons from a superconducting ($T_c=2.7$~K) Sn${}_{0.8}$In${}_{0.2}$Te single crystal sample. The longitudinal acoustic phonon mode and one transverse acoustic branch have been mapped out around the (002) Bragg peak for temperatures of 1.7 K and 4.2 K. We observe a substantial energy width of the transverse phonons at energies comparable to twice the superconducting gap; however, there is no change in this width between the superconducting and normal states. We also confirm that the compound is well ordered, with no indications of structural instability.

5 pages, 4 figures

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Cited by in corpus (1)

• Electron-phonon coupling and superconductivity in the doped topological-crystalline insulator (Pb${}_{0.5}$Sn${}_{0.5}$)${}_{1-x}$In${}_x$Te