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J. Phys. Soc. Jpn. 82, 113701 (2013) [4 Pages]
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LETTERS

Structural Analysis and Superconducting Properties of F-Substituted NdOBiS2 Single Crystals

Masanori Nagao1,2, Satoshi Demura2, Keita Deguchi2, Akira Miura1, Satoshi Watauchi1, Takahiro Takei1, Yoshihiko Takano2, Nobuhiro Kumada1, and Isao Tanaka1
+ Affiliations
1Center for Crystal Science and Technology, University of Yamanashi, Kofu 400-8511, Japan2National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan
Received June 27, 2013; Accepted September 12, 2013; Published October 3, 2013

F-substituted NdOBiS2 superconducting single crystals were grown using CsCl/KCl flux. This is the first example of the single-crystal growth of a BiS2-based superconductor. The obtained single crystals had a plate-like shape with a size of 1–2 mm and a well-developed \(ab\)-plane. The crystal structure of the grown crystals was determined by single-crystal X-ray diffraction analysis to be the tetragonal space group \(P4/nmm\) (#129) with \(a=3.996(3)\) and \(c=13.464(6)\) Å. The chemical formula of the grown crystals was approximately Nd0.98\pm 0.06O0.7\pm 0.1F0.3\pm 0.1Bi0.98\pm 0.04S2, and Cs, K, and Cl were not detected in the grown crystals by electron probe microanalysis. The grown crystals had a critical temperature of approximately 5 K. The superconducting anisotropy of the single crystals was estimated to be about 30 from the effective mass model and the upper critical field.

©2013 The Physical Society of Japan
https://doi.org/10.7566/JPSJ.82.113701
KEYWORDS: BiS\(_{2}\)-based superconductor, single-crystal X-ray diffraction, flux growth, cesium chloride and potassium chloride flux

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