• Letter

Observation of three superconducting transitions in the pressurized CDW-bearing compound TaTe2

Jing Guo, Cheng Huang, Huixia Luo, Huaixin Yang, Linlin Wei, Shu Cai, Yazhou Zhou, Hengcan Zhao, Xiaodong Li, Yanchun Li, Ke Yang, Aiguo Li, Peijie Sun, Jianqi Li, Qi Wu, Robert J. Cava, and Liling Sun
Phys. Rev. Materials 6, L051801 – Published 9 May 2022
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Abstract

Transition metal dichalcogenides host a wide variety of lattice and electronic structures, as well as corresponding exotic physical properties, especially under certain tuning conditions. Here, we report the observation of pressure-induced three superconducting transitions in TaTe2, a charge density wave (CDW)–bearing layered transition-metal dichalcogenide that is metallic but not superconducting at ambient pressure. We find that its CDW state can be easily suppressed upon increasing pressure up to ∼1 GPa. A superconducting state then emerges from the suppressed CDW state and persists to the pressure about 7 GPa. Unexpectedly, another superconducting state appears at ∼11 GPa within the same monoclinic (M) structure of its ambient-pressure one. Upon further compression to 21 GPa, a third superconducting state with higher Tc appears from a high-pressure (HP) phase. Our experimental results suggest that the pressure-induced three superconducting transitions in TaTe2 are, respectively, driven by the suppression of the CDW state, the change of the β angle in the M phase and the transition of M-to-HP phase. These results demonstrate not only the versatile nature of this correlated electron system, but also the first experimental example that shows the pressure-induced evolution from a CDW state to three superconducting states driven by different mechanisms.

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  • Received 15 December 2021
  • Revised 12 April 2022
  • Accepted 22 April 2022

DOI:https://doi.org/10.1103/PhysRevMaterials.6.L051801

©2022 American Physical Society

Physics Subject Headings (PhySH)

  1. Research Areas
Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Jing Guo1,6, Cheng Huang1,5, Huixia Luo2, Huaixin Yang1, Linlin Wei1, Shu Cai1, Yazhou Zhou1, Hengcan Zhao1, Xiaodong Li3, Yanchun Li3, Ke Yang4, Aiguo Li4, Peijie Sun1, Jianqi Li1, Qi Wu1, Robert J. Cava2, and Liling Sun1,5,6,*

  • 1Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 2Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA
  • 3Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
  • 4Shanghai Synchrotron Radiation Facilities, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, China
  • 5University of Chinese Academy of Sciences, Beijing 100190, China
  • 6Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China

  • *Correspondence and requests for materials should be addressed to: llsun@iphy.ac.cn

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Issue

Vol. 6, Iss. 5 — May 2022

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