Physics – Condensed Matter – Superconductivity
Scientific paper
2011-02-11
Solid State Communications 151 (2011) pp. 747-750
Physics
Condensed Matter
Superconductivity
Scientific paper
10.1016/j.ssc.2011.03.014
We report measurements of the temperature and pressure dependence of the electrical resistivity of single crystalline iron-based chalcogenide Cs0.8Fe2Se2. In this material superconductivity Tc~30K develops from a normal state with extremely large resistivity. At ambient pressure a large "hump" in the resistivity is observed around 200K. Under pressure, the resistivity decreases by two orders of magnitude, concomitant with a sudden Tc suppression around p~8GPa. Even at 9GPa 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 superconductivity is not related to this hump.
Conder Kazimierz
Jaccard Didier
Krzton-Maziopa A.
Pedrazzini P.
Pomjakushina Ekaterina
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