Lifting of xz / yz orbital degeneracy at the structural transition in detwinned FeSe

T. Shimojima, Y. Suzuki, T. Sonobe, A. Nakamura, M. Sakano, J. Omachi, K. Yoshioka, M. Kuwata-Gonokami, K. Ono, H. Kumigashira, A. E. Böhmer, F. Hardy, T. Wolf, C. Meingast, H. V. Löhneysen, H. Ikeda, K. Ishizaka

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Abstract

We study superconducting FeSe (Tc=9K) exhibiting the tetragonal-orthorhombic structural transition (Ts∼90K) without any antiferromagnetic ordering, by utilizing angle-resolved photoemission spectroscopy. In the detwinned orthorhombic state, the energy position of the dyz orbital band at the Brillouin zone corner is 50meV higher than that of dxz, indicating the orbital order similar to the NaFeAs and BaFe2As2 families. Evidence of orbital order also appears in the hole bands at the Brillouin zone center. Precisely measured temperature dependence using strain-free samples shows that the onset of the orbital ordering (To) occurs very close to Ts, thus suggesting that the electronic nematicity above Ts is considerably weaker in FeSe compared to BaFe2As2 family.

Original languageEnglish
Article number121111
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume90
Issue number12
DOIs
Publication statusPublished - 2014 Sep 29
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Shimojima, T., Suzuki, Y., Sonobe, T., Nakamura, A., Sakano, M., Omachi, J., Yoshioka, K., Kuwata-Gonokami, M., Ono, K., Kumigashira, H., Böhmer, A. E., Hardy, F., Wolf, T., Meingast, C., Löhneysen, H. V., Ikeda, H., & Ishizaka, K. (2014). Lifting of xz / yz orbital degeneracy at the structural transition in detwinned FeSe. Physical Review B - Condensed Matter and Materials Physics, 90(12), [121111]. https://doi.org/10.1103/PhysRevB.90.121111