Electron–phonon coupling in superconducting 1T-PdTe2

Gloria Anemone, Pablo Casado Aguilar, Manuela Garnica, Fabian Calleja, Amjad Al Taleb, Chia Nung Kuo, Chin Shan Lue, Antonio Politano, Amadeo L. Vázquez de Parga, Giorgio Benedek, Daniel Farías, Rodolfo Miranda

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1 Citation (Scopus)

Abstract

We have determined the electron–phonon interaction in type II Dirac semimetallic 1T-PdTe2 by means of helium atom scattering. While 1T-PdTe2 is isostructural with 1T-PtTe2, only the former is superconductor. The difference can be traced to the substantially larger value of the electron–phonon coupling in 1T-PdTe2, λ = 0.58, obtained from the Debye-Waller attenuation of the He specular peak. With this value and the surface Debye temperature, ΘD = 106.2 K, we have figured out the superconducting critical temperature, Tc = 1.83 K given by the BCS theory, which is in good agreement with Tc = (1.95 ± 0.03) K obtained with low-temperature scanning tunneling microscopy. The value of the effective mass related to ΘD indicates that the large electron–phonon coupling in 1T-PdTe2 is due to coupling, not only with the zone-center optical mode O2 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.

Original languageEnglish
Article number25
Journalnpj 2D Materials and Applications
Volume5
Issue number1
DOIs
Publication statusPublished - 2021 Dec

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanical Engineering
  • Mechanics of Materials
  • Condensed Matter Physics
  • Chemistry(all)

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