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

doi:10.1209/0295-5075/98/27002

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 journal › Article › peer-review

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 language	English
Article number	27002
Journal	EPL
Volume	98
Issue number	2
DOIs	https://doi.org/10.1209/0295-5075/98/27002
Publication status	Published - 2012 Apr

ASJC Scopus subject areas

Physics and Astronomy(all)

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One-step synthesis of K _xFe _2-ySe ₂ single crystal for high critical current density. / Ozaki, Toshinori; Takeya, Hiroyuki; Okazaki, Hiroyuki; Deguchi, Keita; Demura, Satoshi; Kawasaki, Yasuna; Hara, Hiroshi; Watanabe, Tohru; Yamaguchi, Takahide; Takano, Yoshihiko.

In: EPL, Vol. 98, No. 2, 27002, 04.2012.

Research output: Contribution to journal › Article › peer-review

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

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.",

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

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AU - Ozaki, Toshinori

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AU - Deguchi, Keita

AU - Demura, Satoshi

AU - Kawasaki, Yasuna

AU - Hara, Hiroshi

AU - Watanabe, Tohru

AU - Yamaguchi, Takahide

AU - Takano, Yoshihiko

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N2 - 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.

AB - 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.

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One-step synthesis of K _xFe _2-ySe ₂ single crystal for high critical current density

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ASJC Scopus subject areas

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