Electron–phonon coupling in superconducting 1T-PdTe2

Abstract We have determined the electron–phonon interaction in type II Dirac semimetallic 1T-PdTe 2 by means of helium atom scattering. While is isostructural with 1T-PtTe , only former superconductor. The difference can be traced to substantially larger value coupling λ = 0.58, obtained from Debye-Waller attenuation He specular peak. With this and surface Debye temperature, Θ D 106.2 K, we figured out superconducting critical T c 1.83 K given BCS theory, which good agreement (1.95 ± 0.03) low-temperature scanning tunneling microscopy. effective mass related indicates that large due coupling, not zone-center optical mode O at 9.2 meV, as proposed a recent theoretical study, but also zone-boundary acoustic LA. Our results suggest topological states cone play negligible role on onset superconductivity.