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  • Letter

Pressure-induced superconductivity in magnetic topological insulator candidate MnSb4Te7

Cuiying Pei (裴翠颖)1, Ming Xi (席明)2, Qi Wang (王琦)1,3, Wujun Shi (史武军)4,5, Juefei Wu (吴珏霏)1, Lingling Gao (高玲玲)1, Yi Zhao (赵毅)1, Shangjie Tian (田尚杰)2, Weizheng Cao (曹渭征)1 et al.

Changhua Li (李昌华)1, Mingxin Zhang (张明鑫)1, Shihao Zhu (朱世豪)1, Yulin Chen (陈宇林)1,3,6, Hechang Lei (雷和畅)2,*, and Yanpeng Qi (齐彦鹏)1,3,7,†

  • 1School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
  • 2Laboratory for Neutron Scattering, Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices, Department of Physics, Renmin University of China, Beijing 100872, China
  • 3ShanghaiTech Laboratory for Topological Physics, ShanghaiTech University, Shanghai 201210, China
  • 4Center for Transformative Science, ShanghaiTech University, Shanghai 201210, China
  • 5Shanghai High Repetition Rate XFEL and Extreme Light Facility (SHINE), ShanghaiTech University, Shanghai 201210, China
  • 6Department of Physics, Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom
  • 7Shanghai Key Laboratory of High-resolution Electron Microscopy, ShanghaiTech University, Shanghai 201210, China

  • *hlei@ruc.edu.cn
  • †qiyp@shanghaitech.edu.cn
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Phys. Rev. Materials 6, L101801 – Published 24 October, 2022

DOI: https://doi.org/10.1103/PhysRevMaterials.6.L101801

Abstract

The magnetic van der Waals crystals (MnX2Te4)m(X2Te3)n (X=Sb,Bi) have drawn significant attention due to their rich topological properties and tenability by external magnetic field. In this letter, we report on the discovery of superconductivity in magnetic topological insulator candidate MnSb4Te7 (m=1, n=1) via the application of high pressure. The antiferromagnetic ordering is robust to pressure until 8 GPa and then fully suppressed. The carrier type converts from hole to electron accompanied with structural phase transition at ∼16GPa. Superconductivity emerges near the critical pressure 30 GPa where MnSb4Te7 converts to phase III. Interestingly, MnSb4Te7 shows a domelike phase diagram with a maximum Tc of 2.2 K at 50.7 GPa.

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Phys. Rev. Materials 6, L101801– Published 24 October, 2022
  • Received 16 February 2022
  • Accepted 30 September 2022
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