Volume 101, Number 1, January 2013
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||18 January 2013|
Evolution of superconductivity in LaO1−xFxBiS2 prepared by high-pressure technique
1 National Institute for Materials Science - 1-2-1, Sengen, Tsukuba, 305-0047, Ibaraki, Japan
2 University of Tsukuba - 1-1-1, Tennodai, Tsukuba, 305-8577, Ibaraki, Japan
3 Tokyo Metropolitan University - 1-1, Minami-osawa, Hachioji, 192-0397, Tokyo, Japan
Received: 1 October 2012
Accepted: 19 December 2012
Novel BiS2-based superconductors LaO1−xFxBiS2 prepared by a high-pressure synthesis technique were systematically studied. It was found that the high-pressure annealing strongly shrank the lattice as compared to the LaO1−xFxBiS2 samples prepared by conventional solid-state reaction at ambient pressure. Bulk superconductivity was observed within a wide F concentration range of x = 0.2–0.7. On the basis of those results, we have established a phase diagram of LaO1−xFxBiS2.
PACS: 74.70.Dd – Ternary, quaternary, and multinary compounds (including Chevrel phases, borocarbides, etc.) / 74.62.Bf – Effects of material synthesis, crystal structure, and chemical composition / 74.25.Dw – Superconductivity phase diagrams
© EPLA, 2013
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