Superconducting properties of BiSe2-based LaO1−xFxBiSe2 single crystals
High Magnetic Field Laboratory, Chinese Academy of Sciences and University of Science and Technology of China Hefei 230026, PRC
Received: 27 May 2014
Accepted: 16 July 2014
F-doped LaOBiSe2 superconducting single crystals with typical size of are successfully grown by flux method and the superconducting properties are studied. Both the superconducting transition temperature and the shielding volume fraction are effectively improved with fluorine doping. The LaO0.48F0.52BiSe1.93 sample exhibits zero-resistivity at 3.7 K, which is higher than that of the LaO0.5F0.5BiSe2 polycrystalline sample (2.4 K). Bulk superconductivity is confirmed by a clear specific-heat jump at the associated temperature. The samples exhibit strong anisotropy and the anisotropy parameter is about 30, as estimated by the upper critical field and effective mass model.
PACS: 74.70.Dd – Ternary, quaternary, and multinary compounds (including Chevrel phases, borocarbides, etc.) / 74.25.F- – Transport properties / 74.20.Mn – Nonconventional mechanisms
© EPLA, 2014