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)


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.

ジャーナルPhysical review letters
出版ステータスPublished - 2014 12 5

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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