Effects of strain on the electronic structure, superconductivity, and nematicity in FeSe studied by angle-resolved photoemission spectroscopy

G. N. Phan, K. Nakayama, K. Sugawara, T. Sato, T. Urata, Y. Tanabe, K. Tanigaki, F. Nabeshima, Y. Imai, A. Maeda, T. Takahashi

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26 Citations (Scopus)

Abstract

One of central issues in iron-based superconductors is the role of structural change to the superconducting transition temperature (Tc). It was found in FeSe that the lattice strain leads to a drastic increase in Tc, accompanied by suppression of nematic order. By angle-resolved photoemission spectroscopy on tensile- or compressive-strained and strain-free FeSe, we experimentally show that the in-plane strain causes a marked change in the energy overlap (ΔEh-e) between the hole and electron pockets in the normal state. The change in ΔEh-e modifies the Fermi-surface volume, leading to a change in Tc. Furthermore, the strength of nematicity is also found to be characterized by ΔEh-e. These results suggest that the key to understanding the phase diagram is the fermiology and interactions linked to the semimetallic band overlap.

Original languageEnglish
Article number224507
JournalPhysical Review B
Volume95
Issue number22
DOIs
Publication statusPublished - 2017 Jun 9

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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