Transport properties of FeSe1−xSx and FeSe1−yTey epitaxial thin films under magnetic fields

Abstract

Abstract We comparatively investigated transport properties of FeSe1−x S x and FeSe1−y Te y epitaxial thin films under magnetic field. The contrastive behavior between Te and S substituted materials was observed in the carrier density estimated from the Hall effect as a function of x (or y), which is similar to that in T c. This means that the effect of the disappearance of the structural transition is not universal for superconductivity in Fe chalcogenides. T c was found to have a strong correlation with carrier concentration, which is in agreement with our recent result in FeSe film samples where the strain was changed systematically from compressive to tensile.