Unusual temperature evolution of quasiparticle band dispersion in electron-doped fese films

Kosuke Nakayama, Koshin Shigekawa, Katsuaki Sugawara, Takashi Takahashi, Takafumi Sato

Research output: Contribution to journalArticlepeer-review

Abstract

The discovery of high-temperature (high-Tc) superconductivity in one-monolayer FeSe on SrTiO3 has attracted tremendous attention. Subsequent studies suggested the importance of cooperation between intra-FeSe-layer and interfacial interactions to enhance Tc. However, the nature of intra-FeSe-layer interactions, which would play a primary role in determining the pairing symmetry, remains unclear. Here we have performed high-resolution angle-resolved photoemission spectroscopy of one-monolayer and alkaline-metal-deposited multilayer FeSe films on SrTiO3, and determined the evolution of quasiparticle band dispersion across Tc. We found that the band dispersion in the superconducting state deviates from the Bogoliubov-quasiparticle dispersion expected from the normal-state band dispersion with a constant gap size. This suggests highly anisotropic pairing originating from small momentum transfer and/or mass renormalization due to electron–boson coupling. This band anomaly is interpreted in terms of the electronic interactions within the FeSe layers that may be related to the high-Tc superconductivity in electron-doped FeSe.

Original languageEnglish
Article number155
Pages (from-to)1-8
Number of pages8
JournalSymmetry
Volume13
Issue number2
DOIs
Publication statusPublished - 2021 Feb
Externally publishedYes

Keywords

  • ARPES
  • Electronic structure
  • Iron-based superconductors
  • Thin films

ASJC Scopus subject areas

  • Computer Science (miscellaneous)
  • Chemistry (miscellaneous)
  • Mathematics(all)
  • Physics and Astronomy (miscellaneous)

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