In this paper, we systematically study the electron doping effect in a new BiS2-based system Sr1-xLaxFBiS2(0<x<0.7) through multiple techniques of X-ray diffraction, electrical transport, magnetic susceptibility, and Hall effect measurements. The parent compound SrFBiS2 is found to possess a semiconducting-like ground state, with thermally activation energy Eg=38 meV. By the partial substitution of La for Sr, superconductivity emerges when x > 0.3, reaching its maximal superconducting transition temperature Tc=3.5 K at x=0.55. In the normal state of superconducting samples, it is clearly seen that there exists a crossover from metallic to semiconducting state below a temperature Tmin, which shifts to lower temperatures with increasing La content. Based on these measurements, the associated electronic phase diagram of Sr1-xLaxFBiS2 system has thus been established.
@article{arxiv.1310.1695,
title = {Electronic phase diagram in the new BiS2-based Sr1-xLaxFBiS2 system},
author = {Yuke Li and Xi Lin and Lin Li and Nan Zhou and Xiaofeng Xu and Chao Cao and Jianhui Dai and Li Zhang and Yongkang Luo and Wenhe Jiao and Qian Tao and Guanghan Cao and Zhuan Xu},
journal= {arXiv preprint arXiv:1310.1695},
year = {2014}
}