Nature of charge density waves and superconductivity in 1TTaSe2xTex

Y. Liu (刘育), D. F. Shao (邵定夫), L. J. Li, W. J. Lu, X. D. Zhu, P. Tong, R. C. Xiao, L. S. Ling, C. Y. Xi, L. Pi, H. F. Tian, H. X. Yang, J. Q. Li, W. H. Song, X. B. Zhu, and Y. P. Sun
Phys. Rev. B 94, 045131 – Published 21 July 2016

Abstract

Transition-metal dichalcogenides (TMDs) MX2 (M=Ti,Nb,Ta;X=S,Se,Te) exhibit a rich set of charge density wave (CDW) orders, which usually coexist and/or compete with superconductivity. The mechanisms of CDWs and superconductivity in TMDs are still under debate. Here we perform an investigation on a typical TMD system, 1TTaSe2xTex (0x2). Doping-induced disordered distribution of Se/Te suppresses CDWs in 1TTaSe2. A domelike superconducting phase with the maximum Tconset of 2.5 K was observed near CDWs. The superconducting volume is very small inside the CDW phase and becomes very large instantly when the CDW phase is fully suppressed. The observations can be understood based on the strong q-dependent electron-phonon coupling-induced periodic-lattice-distortion (PLD) mechanism of CDWs. The volume variation of superconductivity implies the emergence of domain walls in the suppressing process of CDWs. Our concluded scenario makes a fundamental understanding about CDWs and related superconductivity in TMDs.

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  • Received 10 May 2016
  • Revised 12 July 2016

DOI:https://doi.org/10.1103/PhysRevB.94.045131

©2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Y. Liu (刘育)1,*, D. F. Shao (邵定夫)1,*, L. J. Li1, W. J. Lu1,†, X. D. Zhu2, P. Tong1, R. C. Xiao1, L. S. Ling2, C. Y. Xi2, L. Pi2, H. F. Tian3, H. X. Yang3,‡, J. Q. Li3,4, W. H. Song1, X. B. Zhu1, and Y. P. Sun2,1,5,§

  • 1Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China
  • 2High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei 230031, People's Republic of China
  • 3Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
  • 4Collaborative Innovation Center of Quantum Matter, Beijing 100190, People's Republic of China
  • 5Collaborative Innovation Centre of Advanced Microstructures, Nanjing University, Nanjing 210093, People's Republic of China

  • *These authors contributed equally to this work.
  • Corresponding author: wjlu@issp.ac.cn
  • Corresponding author: hxyang@iphy.ac.cn
  • §Corresponding author: ypsun@issp.ac.cn

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Issue

Vol. 94, Iss. 4 — 15 July 2016

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