One-step synthesis of K xFe 2-ySe 2 single crystal for high critical current density

Toshinori Ozaki, Hiroyuki Takeya, Hiroyuki Okazaki, Keita Deguchi, Satoshi Demura, Yasuna Kawasaki, Hiroshi Hara, Tohru Watanabe, Takahide Yamaguchi, Yoshihiko Takano

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    28 Citations (Scopus)

    Abstract

    We have established a simple process that allows for the one-step synthesis of K xFe 2-ySe 2 single crystals, which exhibit high critical current density J c. The post annealing and quenching technique has improved the homogeneity of as-grown crystals, resulting in full shielding of the external magnetic field. The quenched crystals show a superconducting transition at T c onset=32.9 K and T c zero=32.1 K. The upper critical fields μ 0 H 02 (0) for Hab and Hc are estimated to be ∼206 and ∼50 T, respectively. The critical current densities J c for Hab and Hc reach as high as 1.0×10 5 and 3.4×10 4 A/cm 2 at 5 K. Furthermore, J c exhibits a high field performance and a significantly weak temperature dependence up to 5 T, suggesting strong pinning. These results demonstrate that K xFe 2-ySe 2 would be a promising candidate material for practical applications.

    Original languageEnglish
    Article number27002
    JournalEPL
    Volume98
    Issue number2
    DOIs
    Publication statusPublished - 2012 Apr

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

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    Ozaki, T., Takeya, H., Okazaki, H., Deguchi, K., Demura, S., Kawasaki, Y., Hara, H., Watanabe, T., Yamaguchi, T., & Takano, Y. (2012). One-step synthesis of K xFe 2-ySe 2 single crystal for high critical current density. EPL, 98(2), [27002]. https://doi.org/10.1209/0295-5075/98/27002