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Symmetry breaking via orbital-dependent reconstruction of electronic structure in detwinned NaFeAs

Y. Zhang, C. He, Z. R. Ye, J. Jiang, F. Chen, M. Xu, Q. Q. Ge, B. P. Xie, J. Wei, M. Aeschlimann, X. Y. Cui, M. Shi, J. P. Hu, and D. L. Feng
Phys. Rev. B 85, 085121 – Published 22 February 2012

Abstract

The superconductivity discovered in iron pnictides is intimately related to a nematic ground state, where the C4 rotational symmetry is broken via the structural and magnetic transitions. We here study the nematicity in NaFeAs with polarization-dependent angle-resolved photoemission spectroscopy. A uniaxial pressure was applied on the sample to overcome the twinning effect in the low temperature C2-symmetric state and obtain a much simpler electronic structure than that of a twinned sample. We found the electronic structure undergoes an orbital-dependent reconstruction in the nematic state, primarily involving the dxy- and dyz-dominated bands. These bands strongly hybridize with each other, inducing a band splitting, while the dxz-dominated bands only exhibit an energy shift without any reconstruction. These findings suggest that the spin fluctuations at high temperatures and their coupling with the orbital degree of freedom could be the dominant force to drive the nematicity, while the ferro-orbital ordering between dxz and dyz orbitals can only play a minor role here.

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  • Received 5 December 2011

DOI:https://doi.org/10.1103/PhysRevB.85.085121

©2012 American Physical Society

Authors & Affiliations

Y. Zhang1, C. He1, Z. R. Ye1, J. Jiang1, F. Chen1, M. Xu1, Q. Q. Ge1, B. P. Xie1, J. Wei2, M. Aeschlimann2, X. Y. Cui3, M. Shi3, J. P. Hu4, and D. L. Feng1,*

  • 1State Key Laboratory of Surface Physics, Key Laboratory of Micro and Nano Photonic Structures (MOE), and Department of Physics, Fudan University, Shanghai 200433, People's Republic of China
  • 2Fachbereich Physik and Research Center OPTIMAS, Technische Universitaet Kaiserslautern, Kaiserslautern, 67663, Germany
  • 3Swiss Light Source, Paul-Scherrer Institut, 5232 Villigen, Switzerland
  • 4Department of Physics, Purdue University, West Lafayette, Indiana 47907, USA

  • *dlfeng@fudan.edu.cn

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Vol. 85, Iss. 8 — 15 February 2012

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