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

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)


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
Issue number2
Publication statusPublished - Apr 2012
Externally publishedYes


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