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Disorder-robust high-field superconducting phase of FeSe single crystals

Nan Zhou1,2,3,*, Yue Sun1,4,*,†, C. Y. Xi2, Z. S. Wang2, J. L. Zhang2, Y. Zhang2, Y. F. Zhang1, C. Q. Xu1, Y. Q. Pan1 et al.

J. J. Feng1, Y. Meng1, X. L. Yi1, L. Pi2, T. Tamegai5, Xiangzhuo Xing1,‡, and Zhixiang Shi1,§

  • 1School of Physics and Key Laboratory of MEMS of the Ministry of Education, Southeast University, Nanjing 211189, China
  • 2Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei 230031, China
  • 3Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
  • 4Department of Physics and Mathematics, Aoyama Gaguin University, Kanagawa 252-5258, Japan
  • 5Department of Applied Physics, The University of Tokyo, Tokyo 113-8656, Japan

  • *These authors contributed equally to this work.
  • †Corresponding author: sunyue@phys.aoyama.ac.jp
  • ‡Corresponding author: xzxing@seu.edu.cn
  • §Corresponding author: zxshi@seu.edu.cn
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Phys. Rev. B 104, L140504 – Published 18 October, 2021

DOI: https://doi.org/10.1103/PhysRevB.104.L140504

Abstract

When exposed to high magnetic fields, certain materials manifest an exotic superconducting (SC) phase that has attracted considerable attention. A proposed explanation for the origin of the high-field SC phase is the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state. This state is characterized by inhomogeneous superconductivity, where the Cooper pairs have finite center-of-mass momenta. Recently, the high-field SC phase was observed in FeSe, and it was deemed to originate from the FFLO state. Here, we synthesize FeSe single crystals with different levels of disorder. The level of disorder is expressed by the ratio of the mean free path to the coherence length and ranges between 35 and 1.2. The upper critical field Bc2 was obtained by both resistivity and magnetic torque measurements over a wide range of temperatures, which went as low as ∼0.5 K, and magnetic fields, which went up to ∼38 T along the c axis and in the ab plane. In the high-field region parallel to the ab plane, an unusual SC phase was confirmed in all the crystals, and the phase was found to be robust against disorder. This result suggests that the high-field SC phase in FeSe is not a conventional FFLO state.

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Phys. Rev. B 104, L140504– Published 18 October, 2021
  • Received 26 January 2021
  • Revised 3 September 2021
  • Accepted 1 October 2021
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