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arXiv · 1407.6114

Superconducting properties of novel BiSe$_{2}$-based layered LaO$_{1-x}$F$_{x}$BiSe$_{2}$ single crystals

Jifeng Shao·Zhongheng Liu·Xiong Yao·Lei Zhang·Li Pi·Shun Tan·Changjin Zhang·Yuheng Zhang
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Abstract

F-doped LaOBiSe$_{2}$ superconducting single crystals with typical size of 2$\times$4$\times$0.2 mm$^{3}$ 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 LaO$_{0.48}$F$_{0.52}$BiSe$_{1.93}$ sample exhibits zero-resistivity at 3.7 K, which is higher than that of the LaO$_{0.5}$F$_{0.5}$BiSe$_{2}$ polycrystalline sample (2.4K). 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

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Jifeng Shao, Zhongheng Liu, Xiong Yao, Lei Zhang, Li Pi, Shun Tan, Changjin Zhang, Yuheng Zhang. 2014-07-23. Superconducting properties of novel BiSe$_{2}$-based layered LaO$_{1-x}$F$_{x}$BiSe$_{2}$ single crystals. https://doi.org/10.1209/0295-5075%2F107%2F37006

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