摘要
The latest discovery of a new iron-chalcogenide superconductor AXFe2-ySe2 （A =K, Cs, Rb, and Tl, etc.） has attracted much attention due to a number of its unique characteristics, such as the possible insulating state of the parent compound, the existence of Fe-vacancy and its ordering, a new form of magnetic structure and its interplay with superconductivity, and the peculiar electronic structures that are distinct from other Fe-based superconductors. In this paper, we present a brief review on the structural, magnetic and electronic properties of this new superconductor, with an emphasis on the electronic structure and superconducting gap. Issues and future perspectives are discussed at the end of the paper.
The latest discovery of a new iron-chalcogenide superconductor AXFe2-ySe2 （A =K, Cs, Rb, and Tl, etc.） has attracted much attention due to a number of its unique characteristics, such as the possible insulating state of the parent compound, the existence of Fe-vacancy and its ordering, a new form of magnetic structure and its interplay with superconductivity, and the peculiar electronic structures that are distinct from other Fe-based superconductors. In this paper, we present a brief review on the structural, magnetic and electronic properties of this new superconductor, with an emphasis on the electronic structure and superconducting gap. Issues and future perspectives are discussed at the end of the paper.
基金
Acknowledgements We would like to thank the collaborations with Shanyu Liu, Xiaowen Jia, Junfeng He, Yingying Peng, Li Yu, Xu Liu, Guodong Liu, Shaolong He, Xiaoli Dong, Jun Zhang, Hangdong Wang, Chiheng Dong, Minghu Fang, J. B. He, D. M. Wang, G. F. Chert, J. G. Guo, X. L. Chen, Xiaoyang Wang, Qinjun Peng, Zhimin Wang, Shenjin Zhang, Feng Yang, Zuyan Xu, and Chuangtian Chen. This work was financially supported by the National Natural Science Foundation of China （Grant No. 10734120） and the State Key Development Program for Basic Research of China （973 program, Grant No. 2011CB921703）.
