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Hidden antiferronematic order in Fe-based superconductor BaFe2As2 and NaFeAs above TS

Seiichiro Onari and Hiroshi Kontani

  • Department of Physics, Nagoya University, Furo-cho, Nagoya 464-8602, Japan

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Phys. Rev. Research 2, 042005(R) – Published 12 October, 2020

DOI: https://doi.org/10.1103/PhysRevResearch.2.042005

Abstract

In several Fe-based superconductors, slight C4 symmetry breaking occurs at T*, which is tens of degrees Kelvin higher than the structural transition temperature TS. In this “hidden” nematic state at TS<T<T*, the orthorhombicity is tiny [ϕ=(a−b)/(a+b)≪0.1%], but clear evidence of a bulk phase transition has been accumulated. To explain this long-standing mystery, we propose the emergence of antiferro-bond (AFB) order with the AF wave vector q=(0,π) at T=T*, by which the characteristic phenomena below T* are satisfactorily explained. This AFB order originates from the interorbital nesting between the dxy-orbital hole pocket and the electron pocket, and this interorbital bond order naturally explains the pseudogap, band folding, and tiny nematicity that is linear in T*−T. The hidden AFB order explains key experiments in both BaFe2As2 and NaFeAs, but it is not expected to occur in FeSe because of the absence of the dxy-orbital hole pocket.

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Outline

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Phys. Rev. Research 2, 042005(R)– Published 12 October, 2020
  • Received 25 November 2019
  • Revised 8 April 2020
  • Accepted 21 September 2020
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