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Excess superconductivity at temperatures above the superconducting transition in FeSe


A.V. Frolov – Junior Research Scientist, V.A. Kotel’nikov IRE RAS (Moscow)
A.A. Sinchenko – Dr.Sc. (Phys.-Math.), Head of Laboratory, V.A. Kotel’nikov IRE RAS (Moscow)
A.P. Orlov – Ph.D. (Phys.-Math.), Senior Research Scientist, V.A. Kotel’nikov IRE RAS (Moscow)
D.A. Chareev - Ph.D. (Chem), Senior Research Scientist, Institute of Experimental Mineralogy of RAS (Moscow)

The electron transport in mesastructures based on FeSe in directions along and across the layers of a single crystal has been studied. As the current flows across the layers, an increase in the temperature of the superconducting transition (Tc) is observed, as well as the existence of excess conductivity at temperatures up to 40 K, which is much higher than the value of Tc along the layers. The observed effects are associated with the existence of small isolated superconducting inclusions in FeSe.

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