Correlation between superconducting transition temperatures and carrier densities in Te- and S-substituted FeSe thin films

Fuyuki Nabeshima, Tomoya Ishikawa, Naoki Shikama, and Atsutaka Maeda
Phys. Rev. B 101, 184517 – Published 20 May 2020

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 Tc 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 Tc behaviors at the end point of the structural transition.

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  • Received 11 June 2019
  • Revised 30 April 2020
  • Accepted 30 April 2020

DOI:https://doi.org/10.1103/PhysRevB.101.184517

©2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Fuyuki Nabeshima*, Tomoya Ishikawa, Naoki Shikama, and Atsutaka Maeda

  • Department of Basic Science, The University of Tokyo, Meguro, Tokyo 153-8902, Japan

  • *cnabeshima@g.ecc.u-tokyo.ac.jp

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Vol. 101, Iss. 18 — 1 May 2020

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