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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, and K. Ishizaka
Phys. Rev. B 90, 121111(R) – Published 29 September 2014

Abstract

We study superconducting FeSe (Tc=9K) exhibiting the tetragonal-orthorhombic structural transition (Ts90K) 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.

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  • Received 4 July 2014
  • Revised 11 September 2014

DOI:https://doi.org/10.1103/PhysRevB.90.121111

©2014 American Physical Society

Authors & Affiliations

T. Shimojima1,*, Y. Suzuki1, T. Sonobe1, A. Nakamura1, M. Sakano1, J. Omachi2, K. Yoshioka3, M. Kuwata-Gonokami2,3, K. Ono4, H. Kumigashira4, A. E. Böhmer5, F. Hardy5, T. Wolf5, C. Meingast5, H. v. Löhneysen5,6, H. Ikeda7, and K. Ishizaka1

  • 1Quantum-Phase Electronics Center (QPEC) and Department of Applied Physics, The University of Tokyo, Bunkyo, Tokyo 113-8656, Japan
  • 2Photon Science Center, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
  • 3Department of Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
  • 4KEK, Photon Factory, Tsukuba, Ibaraki 305-0801, Japan
  • 5Institut für Festkörperphysik, Karlsruhe Institute of Technology, 76021 Karlsruhe, Germany
  • 6Physikalisches Institut, Karlsruhe Institute of Technology, 76128 Karlsruhe, Germany
  • 7Department of Physics, Kyoto University, Kyoto 606-8502, Japan

  • *Corresponding author: shimojima@ap.t.u-tokyo.ac.jp

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Vol. 90, Iss. 12 — 15 September 2014

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