期刊
SOLID STATE COMMUNICATIONS
卷 151, 期 10, 页码 747-750出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ssc.2011.03.014
关键词
Intercalated Fe chalcogenide; Superconductivity; High pressure; Electrical resistivity
资金
- Swiss National Science Foundation through the NCCR
We report measurements of the temperature and pressure dependence of the electrical resistivity (rho) of single-crystalline iron-based chalcogenide Cs0.8Fe2Se2. In this material, superconductivity with a transition temperature (T-c) similar to 30 K develops from a normal state with extremely large resistivity. At ambient pressure, a large hump in the resistivity is observed around 200 K. Under pressure, the resistivity decreases by two orders of magnitude, concomitant with a sudden T-c suppression around p(c) similar to 8 GPa. Even at 9 GPa a metallic resistivity state is not recovered, and the rho(T) hump is still detected. A comparison of the data measured upon increasing and decreasing the external pressure leads us to suggest that the superconductivity is not related to this hump. (C) 2011 Elsevier Ltd. All rights reserved.
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