Evolution of two-gap behavior of the superconductor FeSe1-x
Abstract
The superfluid density, s, of the iron chalcogenide superconductor, FeSe1-x, was studied as a function of pressure by means of muon-spin rotation. The zero-temperature value of s increases with increasing transition temperature Tc (increasing pressure) following the tendency observed for various Fe-based and cuprate superconductors. The analysis of s(T) within the two-gap scheme reveals that the effect on both, Tc and s(0), is entirely determined by the band(s) where the large superconducting gap develops, while the band(s) with the small gap become practically unaffected.
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