Momentum-dependent sign inversion of orbital order in superconducting FeSe

Y. Suzuki, T. Shimojima, T. Sonobe, A. Nakamura, M. Sakano, H. Tsuji, J. Omachi, K. Yoshioka, M. Kuwata-Gonokami, T. Watashige, R. Kobayashi, S. Kasahara, T. Shibauchi, Y. Matsuda, Y. Yamakawa, H. Kontani, and K. Ishizaka
Phys. Rev. B 92, 205117 – Published 13 November 2015
PDFHTMLExport Citation

Abstract

We investigate the electronic reconstruction across the tetragonal-orthorhombic structural transition in FeSe by employing polarization-dependent angle-resolved photoemission spectroscopy on detwinned single crystals. Across the structural transition, the electronic structures around the Γ and M points are modified from fourfold to twofold symmetry due to the lifting of degeneracy in dxz/dyz orbitals. The dxz band shifts upward at the Γ point, while it moves downward at the M point, suggesting that the electronic structure of orthorhombic FeSe is characterized by a momentum-dependent sign-changing orbital polarization. Due to this sign-changing orbital order, the elongated directions of the elliptical Fermi surfaces at the Γ and M points are rotated by 90° with respect to each other, which makes the nesting condition between these FSs imperfect. The present result, supported by calculations, indicates the possible suppression of the spin-fluctuation mediated superconductivity in the orthorhombic FeSe, as compared to the orbital-ordered state without sign change.

  • Figure
  • Figure
  • Figure
  • Figure
  • Received 3 April 2015
  • Revised 17 October 2015

DOI:https://doi.org/10.1103/PhysRevB.92.205117

©2015 American Physical Society

Authors & Affiliations

Y. Suzuki1, T. Shimojima1, T. Sonobe1, A. Nakamura1, M. Sakano1, H. Tsuji1, J. Omachi2, K. Yoshioka3, M. Kuwata-Gonokami2,3, T. Watashige4, R. Kobayashi4, S. Kasahara4, T. Shibauchi5, Y. Matsuda4, Y. Yamakawa6, H. Kontani6, 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
  • 4Department of Physics, Kyoto University, Kyoto 606-8502, Japan
  • 5Department of Advanced Materials Science, The University of Tokyo, Chiba 277-8561, Japan
  • 6Department of Physics, Nagoya University, Furo-cho, Nagoya 464-8602, Japan

Article Text (Subscription Required)

Click to Expand

Supplemental Material (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 92, Iss. 20 — 15 November 2015

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review B

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×