Fluorine solubility and superconducting properties of Sm(O,F)BiS2 single crystals

[摘要] Sm(O,F)BiS2 superconducting single crystals with various nominal F contents have been grown using KI-KCl flux. The solid solution limit of F at the O-site in Sm(O,F)BiS2 single crystals was approximately less than 20 at%. F concentrations of Sm(O,F)BiS2 single crystals were hardly controlled by nominal F contents. It suggests the existence of intrinsic stable phase. Superconductivity was shown at around 5 K. Superconducting transition temperature with zero resistivity were increased with increasing nominal F contents within less than 70 at% in O-site, despite similar F concentration and c-axis lattice constants. (C) 2021 Elsevier B.V. All rights reserved.

[发布日期] 2021-11-25

[关键词] Rare earth alloys and compounds, Superconductors;Crystal growth;Anisotropy;NEXAFS, X-ray diffraction