Abstract
We comparatively investigated the transport properties for S- and Te-substituted FeSe thin films under magnetic fields to clarify the origin of the contrasting behavior of the superconducting transition temperature in S and Te substitution. A classical two-carrier analysis revealed that the carrier densities of the films increased with increasing Te content, while no significant change was observed for the S substitution, which suggests a correlation between and the carrier densities. These observations suggest that the structural transition affects the electronic structure in a different manner between Fe(Se,S) and Fe(Se,Te) and that this fact is the direct cause of the difference in the behaviors at the end point of the structural transition.
- Received 11 June 2019
- Revised 30 April 2020
- Accepted 30 April 2020
DOI:https://doi.org/10.1103/PhysRevB.101.184517
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