Electron–phonon coupling in superconducting 1T-PdTe2
We have determined the electron–phonon interaction in type II Dirac semimetallic 1T-PdTe 2 by means of helium atom scattering. While 1T-PdTe 2 is isostructural with 1T-PtTe 2 , only the former is superconductor. The difference can be traced to the substantially larger value of the electron–phonon co...
Gespeichert in:
Veröffentlicht in: | NPJ 2D materials and applications 2021-02, Vol.5 (1), p.1-7, Article 25 |
---|---|
Hauptverfasser: | , , , , , , , , , , , |
Format: | Artikel |
Sprache: | eng |
Schlagworte: | |
Online-Zugang: | Volltext |
Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
Zusammenfassung: | We have determined the electron–phonon interaction in type II Dirac semimetallic 1T-PdTe
2
by means of helium atom scattering. While 1T-PdTe
2
is isostructural with 1T-PtTe
2
, only the former is superconductor. The difference can be traced to the substantially larger value of the electron–phonon coupling in 1T-PdTe
2
,
λ
= 0.58, obtained from the Debye-Waller attenuation of the He specular peak. With this value and the surface Debye temperature, Θ
D
= 106.2 K, we have figured out the superconducting critical temperature,
T
c
= 1.83 K given by the BCS theory, which is in good agreement with
T
c
= (1.95 ± 0.03) K obtained with low-temperature scanning tunneling microscopy. The value of the effective mass related to Θ
D
indicates that the large electron–phonon coupling in 1T-PdTe
2
is due to coupling, not only with the zone-center optical mode O
2
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. |
---|---|
ISSN: | 2397-7132 2397-7132 |
DOI: | 10.1038/s41699-021-00204-5 |