Effects of heavy-ion irradiation on FeSe

Yue Sun, Akiyoshi Park, Sunseng Pyon, Tsuyoshi Tamegai, Tadashi Kambara, and Ataru Ichinose
Phys. Rev. B 95, 104514 – Published 21 March 2017

Abstract

We report the effects of heavy-ion irradiation on FeSe single crystals by irradiating uranium up to a dose-equivalent matching field of Bϕ=16 T. Almost continuous columnar defects along the c axis with a diameter of 10 nm are confirmed by high-resolution transmission electron microscopy. Tc is found to be suppressed by introducing columnar defects at a rate of dTc/dBϕ0.29 K/T, which is much larger than those observed in iron pnictides. This unexpected large suppression of Tc in FeSe is discussed in relation to the large diameter of the columnar defects as well as its unique band structure with a remarkably small Fermi energy. The critical current density is first dramatically enhanced with irradiation reaching a value over 2×105A/cm2 (5 times larger than that of the pristine sample) at 2 K (self-field) with Bϕ=2 T, then gradually suppressed with increasing Bϕ. The δl pinning associated with charge-carrier mean-free-path fluctuations and the δTc pinning associated with spatial fluctuations of the transition temperature are found to coexist in the pristine FeSe, while the irradiation increases the contribution from δl pinning and makes it dominant over Bϕ=4 T.

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  • Received 24 September 2016
  • Revised 17 January 2017

DOI:https://doi.org/10.1103/PhysRevB.95.104514

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Yue Sun1,*, Akiyoshi Park1, Sunseng Pyon1, Tsuyoshi Tamegai1, Tadashi Kambara2, and Ataru Ichinose3

  • 1Department of Applied Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
  • 2Nishina Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
  • 3Central Research Institute of Electric Power Industry, Electric Power Engineering Research Laboratory, 2-6-1, Nagasaka, Yokosuka-shi, Kanagawa 240-0196, Japan

  • *sunyue@issp.u-tokyo.ac.jp

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Issue

Vol. 95, Iss. 10 — 1 March 2017

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