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.

Anemone, G., Casado Aguilar, P., Garnica, M., Calleja, F., Al Taleb, A., Kuo, C., et al. (2021). Electron–phonon coupling in superconducting 1T-PdTe2. NPJ 2D MATERIALS AND APPLICATIONS, 5(1), 25-31 [10.1038/s41699-021-00204-5].

Electron–phonon coupling in superconducting 1T-PdTe2

Giorgio Benedek;
2021

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.
Si
Articolo in rivista - Articolo scientifico
Scientifica
Helium atom scattering, Topological insulators, Electron-phonon interaction
English
25
31
7
Anemone, G., Casado Aguilar, P., Garnica, M., Calleja, F., Al Taleb, A., Kuo, C., et al. (2021). Electron–phonon coupling in superconducting 1T-PdTe2. NPJ 2D MATERIALS AND APPLICATIONS, 5(1), 25-31 [10.1038/s41699-021-00204-5].
Anemone, G; Casado Aguilar, P; Garnica, M; Calleja, F; Al Taleb, A; Kuo, C; Shan Lue, C; Politano, A; Vazquez de Parga, A; Benedek, G; Farias, D; Miranda, R
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/10281/392470
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