Dynamics of Vortices in Heavy-ion Irradiated Co-doped BaFe$_2$As$_2$

ORAL

Abstract

Effects of heavy-ion irradiation on the critical current density, $J_c$, and vortex dynamics are investigated in Ba(Fe$_{1-x}$Co$_x$)$_2$As$_2$ irradiated by heavy- ions of various kinds. Irradiations induce a large enhancement of $J_c$ in the case of 200 MeV Au creating nearly continuous columnar tracks. On the other hand, in the case of 800 MeV Xe irradiation, despite the enhancement of $J_c$, clear columnar defects are not observed. In the case of 2.6 GeV U irradiation, new types of structure appears in the $M$-$H$ loop at high matching field. We also discuss the behavior of vortex dynamics in the irradiated Ba(Fe$_{1-x}$Co$_x$)$_2$As$_2$.

*This work is partly supported by JST, Transformative Research-Proiect on Iron Pnictides (TRIP)

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Authors

  • Tsuyoshi Tamegai

    • Dep. of Appl. Phys., The Univ. of Tokyo
    • University of Tokyo

  • Toshihiro Taen

    • Dep. of Appl. Phys., The Univ. of Tokyo

  • Hidenori Yagyuda

    • Dep. of Appl. Phys., The Univ. of Tokyo

  • Tomotaka Taniguchi

    • Dep. of Appl. Phys., The Univ. of Tokyo

  • Shyam Mohan

    • Dep. of Appl. Phys., The Univ. of Tokyo

  • Yasuyuki Nakajima

    • Dep. of Appl. Phys., The Univ. of Tokyo

  • Satoru Okayasu

    • Advanced Science Research Center, Japan Atomic Energy Agency

  • Masato Sasase

    • The Wakasa-wan Energy Research Center, Research \& Development Group

  • Hisashi Kitamura

    • National Institute of Radiological Sciences

  • Takeshi Murakami

    • National Institute of Radiological Sciences

  • Tadashi Kambara

    • Nishina Center for Accelerator Based Science, RIKEN

  • Yasuyuki Kanai

    • IThe Institute of Physical and Chemical Research, RIKEN