Investigation of the Electron-Phonon Coupling in Dirac Semimetal PdTe2 via Temperature-Dependent Raman Spectroscopy

被引：13

作者：

AL-Makeen, Mansour M. ^{[1
,2
]}

Guo, Xiao ^{[1
]}

Wang, Yongsong ^{[1
]}

Yang, Dingbang ^{[1
]}

You, Siwen ^{[1
]}

Yassine, Madoune ^{[1
]}

Jiang, Junjie ^{[1
]}

Song, Peng-Bo ^{[3
,4
]}

Shi, You-Guo ^{[3
,4
]}

Xie, Haipeng ^{[1
]}

Meng, Jian-Qiao ^{[1
]}

Huang, Han ^{[1
]}

机构：

[1] Cent South Univ, Sch Phys & Elect, Hunan Key Lab Super Microstruct & Ultrafast Proc, 932 South Lushan Rd, Changsha 410083, Hunan, Peoples R China

[2] Sanaa Univ, Phys Dept, Sanaa 1247, Yemen

[3] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China

[4] Univ Chinese Acad Sci, Sch Phys Sci, Beijing 100049, Peoples R China

来源：

PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS | 2022年 / 16卷 / 12期

关键词：

electron-phonon coupling; phonon anharmonicity; temperature-dependent Raman spectra; METAL DICHALCOGENIDES; SINGLE-LAYER; SCATTERING; DYNAMICS; SN; PD;

D O I：

10.1002/pssr.202200257

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Layered Palladium ditelluride (PdTe2) 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 lambda of E (g) (in-plane) and A (1g) (out-of-plane) modes in the exfoliated PdTe2 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 lambda E g = 1.54 and lambda A 1 g = 0.55, respectively. The Raman results confirm that PdTe2 is a phonon-mediated Bardeen-Cooper-Schrieffer superconductor.

引用

页数：7

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