Coexistence of Replica Bands and Superconductivity in FeSe Monolayer Films

S. N. Rebec, T. Jia, C. Zhang, M. Hashimoto, D.-H. Lu, R. G. Moore, and Z.-X. Shen
Phys. Rev. Lett. 118, 067002 – Published 10 February 2017
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Abstract

To elucidate the mechanisms behind the enhanced Tc in monolayer (1 ML) FeSe on SrTiO3 (STO), we grew highly strained 1 ML FeSe on the rectangular (100) face of rutile TiO2, and observed the coexistence of replica bands and superconductivity with a Tc of 63 K. From the similar Tc between this system and 1ML FeSe on STO (001), we conclude that strain and dielectric constant are likely unimportant to the enhanced Tc in these systems. A systematic comparison of 1 ML FeSe on TiO2 with other systems in the FeSe family shows that while charge transfer alone can enhance Tc, it is only with the addition of interfacial electron-phonon coupling that Tc can be increased to the level seen in 1 ML FeSe on STO.

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  • Received 30 June 2016

DOI:https://doi.org/10.1103/PhysRevLett.118.067002

© 2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

S. N. Rebec1,2, T. Jia2,3, C. Zhang2,3, M. Hashimoto4, D.-H. Lu4, R. G. Moore2, and Z.-X. Shen1,2,3

  • 1Department of Applied Physics, Stanford University, Stanford, California 94305, USA
  • 2Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
  • 3Department of Physics, Stanford University, Stanford, California 94305, USA
  • 4Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA

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Vol. 118, Iss. 6 — 10 February 2017

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