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Pressure cycle of superconducting Cs0.8Fe2Se2 : A transport study

Authors
Pedrazzini, P.
Krzton-Maziopa, A.
Pomjakushina, E.
Conder, K.
Shermadini, Z.
Published in Solid State Communications. 2011, vol. 151, no. 10, p. 747-750
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 (Tc ) ∼ 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 Tc suppression around pc ∼ 8 GPa. 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.
Keywords Intercalated Fe chalcogenideSuperconductivityHigh pressureElectrical resistivity
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SEYFARTH, Gabriel et al. Pressure cycle of superconducting Cs0.8Fe2Se2 : A transport study. In: Solid State Communications, 2011, vol. 151, n° 10, p. 747-750. https://archive-ouverte.unige.ch/unige:35701

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Deposited on : 2014-04-15

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