Peiwen Gao, Rong Yu, Liling Sun, Hangdong Wang, Zhen Wang, Qi Wu, Minghu Fang, Genfu Chen, Jing Guo, Chao Zhang, Dachun Gu, Huanfang Tian, Jianqi Li, Jing Liu, Yanchun Li, Xiaodong Li, Qimiao Si, Zhongxian Zhao
Here we show that a pressure of about 8 GPa suppresses both the vacancy order and the insulating phase, and a further increase of the pressure to about 18 GPa induces a second transition or crossover. No superconductivity has been found in compressed insulating 245 phase. The metallic phase in the intermediate pressure range has a distinct behavior in the transport property, which is also observed in the superconducting sample. We interpret this intermediate metal as an orbital selective Mott phase (OSMP). Our results suggest that the OSMP provides the physical pathway connecting the insulating and superconducting phases of these iron selenide materials.
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http://arxiv.org/abs/1209.1340
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