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, Yoichi Tanabe, Katsumi Tanigaki, F. Nabeshima, Y. Imai, A. Maeda, Takashi Takahashi

研究成果: Article査読

37 被引用数 (Scopus)

抄録

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.

本文言語English
論文番号224507
ジャーナルPhysical Review B
95
22
DOI
出版ステータスPublished - 2017 6月 9

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学

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