arXiv 1208.50002012-08-24cond-mat.supr-con

Superconductivity Appears in the Vicinity of an Insulating-Like Behavior in CeO$_{1-x}$F$_{x}$BiS$_{2}$

Jie Xing, Sheng Li, Xiaxing Ding, Huang Yang, Hai-Hu Wen

备注：: 5 pages, 5 figures
发表信息：: Phys. Rev. B 86, 214518 (2012)
DOI：: 10.1103/PhysRevB.86.214518

英文摘要：

Resistive and magnetization properties have been measured in BiS$_2$-based samples CeO$_{1-x}$F$_{x}$BiS$_{2}$ with a systematic substitution of O with F (0 $<$ x $<$ 0.6). In contrast to the band structure calculations, it is found that the parent phase of CeOBiS$_2$ is a bad metal, instead of an band insulator. By doping electrons into the system, it is surprising to find that superconductivity appears together with an insulating normal state. This evolution is clearly different from the cuprate and the iron pnictide systems, and is interpreted as approaching the von Hove singularity. Furthermore, ferromagnetism which may arise from the Ce moments, has been observed in the low temperature region in all samples, suggesting the co-existence of superconductivity and ferromagnetism in the superconducting samples.

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