Investigation of the Electron–Phonon Coupling in Dirac Semimetal PdTe<sub>2</sub> via Temperature‐Dependent Raman Spectroscopy
Mansour M. Al-Makeen, Xiao Guo, Yongsong Wang, Dingbang Yang, Siwen You, Madoune Yassine, Junjie Jiang, Peng-Bo Song, Youguo Shi, Haipeng Xie, Jian-Qiao Meng, Han Huang
Abstract
Layered Palladium ditelluride (PdTe 2 ) is an interesting noble‐transition‐metal dichalcogenide with high electrical and thermal conductivity, exhibiting superconductivity and a type‐II Dirac semimetallic phase due to the increased electron–phonon (e–ph) coupling. Herein, the e–ph coupling constant λ of E g (in‐plane) and A 1g (out‐of‐plane) modes in the exfoliated PdTe 2 nanoflakes via temperature‐dependent Raman spectroscopy within the temperature range from 80 to 580 K is determined. Both E g mode with a Gaussian line shape and A 1g mode with a Breit–Wigner–Fano line shape show nonlinear frequency redshift and linewidth broadening with temperature. The extracted e–ph coupling constants are = 1.54 and = 0.55, respectively. The Raman results confirm that PdTe 2 is a phonon‐mediated Bardeen–Cooper–Schrieffer superconductor.