Pressure cycle of superconducting Cs0.8Fe2Se2 : A transport study |
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| Authors: | G Seyfarth D Jaccard A Krzton-Maziopa K Conder |
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| Institution: | a DPMC - Université de Genève, Quai Ernest Ansermet 24, 1211 Geneva 4, Switzerlandb Lab. Bajas Temperaturas and Instituto Balseiro, Centro Atómico Bariloche (CNEA), 8400 S.C. de Bariloche, Argentinac Lab. for Developments and Methods, Paul Scherrer Institute, 5232 Villigen PSI, Switzerlandd Lab. for Muon-Spin Spectroscopy, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland |
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| Abstract: | We report measurements of the temperature and pressure dependence of the electrical resistivity (ρ) of single-crystalline iron-based chalcogenide Cs0.8Fe2Se2. In this material, superconductivity with a transition temperature  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 Tc suppression around  . Even at 9 GPa a metallic resistivity state is not recovered, and the ρ(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. |
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| Keywords: | A Intercalated Fe chalcogenide D Superconductivity E High pressure E Electrical resistivity |
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