Reconstruction of band structure induced by electronic nematicity in an fese superconductor

K. Nakayama, Y. Miyata, G. N. Phan, T. Sato, Y. Tanabe, T. Urata, K. Tanigaki, T. Takahashi

研究成果: Article査読

187 被引用数 (Scopus)

抄録

We have performed high-resolution angle-resolved photoemission spectroscopy on an FeSe superconductor (Tc∼8K), which exhibits a tetragonal-to-orthorhombic structural transition at Ts∼90K. At low temperature, we found splitting of the energy bands as large as 50 meV at the M point in the Brillouin zone, likely caused by the formation of electronically driven nematic states. This band splitting persists up to T∼110K, slightly above Ts, suggesting that the structural transition is triggered by the electronic nematicity. We have also revealed that at low temperature the band splitting gives rise to a van Hove singularity within 5 meV of the Fermi energy. The present result strongly suggests that this unusual electronic state is responsible for the unconventional superconductivity in FeSe.

本文言語English
論文番号237001
ジャーナルPhysical review letters
113
23
DOI
出版ステータスPublished - 2014 12 5

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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