Electron–phonon coupling in superconducting 1T-PdTe2

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

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