Electron-phonon coupling in superconducting 1T-PdTe2

被引：37

作者：

Anemone, Gloria ^{[1
,2
,3
]}

Casado Aguilar, Pablo ^{[1
,2
]}

Garnica, Manuela ^{[2
]}

Calleja, Fabian ^{[2
]}

Al Taleb, Amjad ^{[2
]}

Kuo, Chia-Nung ^{[4
]}

Lue, Chin Shan ^{[4
]}

Politano, Antonio ^{[5
,6
]}

Vazquez de Parga, Amadeo L. ^{[1
,2
,7
,8
]}

Benedek, Giorgio ^{[9
,10
]}

Farias, Daniel ^{[1
,7
,8
]}

Miranda, Rodolfo ^{[1
,2
,7
,8
]}

机构：

[1] Univ Autonoma Madrid, Dept Fis Mat Condensada, Madrid, Spain

[2] Inst Madrileno Estudios Avanzados Nanociencia IMD, Madrid, Spain

[3] Univ San Pablo, CEU, CEU Univ, Dept Matemat Aplicada & Estadist, Madrid, Spain

[4] Natl Cheng Kung Univ, Dept Phys, Tainan, Taiwan

[5] Univ Aquila, Dipartimento Sci Fis & Chim DSFC, Laquila, Italy

[6] CNR IMM Ist Microelettron & Microsistemi, Catania, Italy

[7] Univ Autonoma Madrid, Inst Nicolas Cabrera, Madrid, Spain

[8] Univ Autonoma Madrid, Condensed Matter Phys Ctr IFIMAC, Madrid, Spain

[9] Univ Milano Bicocca, Dipartimento Sci Mat, Milan, Italy

[10] Univ Basque Country EHU UPV, Donostia Int Phys Ctr DIPC, Donostia San Sebastian, Spain

来源：

NPJ 2D MATERIALS AND APPLICATIONS | 2021年 / 5卷 / 01期

关键词：

D O I：

10.1038/s41699-021-00204-5

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

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, lambda = 0.58, obtained from the Debye-Waller attenuation of the He specular peak. With this value and the surface Debye temperature, Theta(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 Theta(D) indicates that the large electron-phonon coupling in 1T-PdTe2 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.

引用

页数：7

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