Hidden antiferronematic order in Fe-based superconductor BaFe_{2}As_{2} and NaFeAs above T_{S} by Seiichiro Onari, Hiroshi Kontani

“…In several Fe-based superconductors, slight C_{4} symmetry breaking occurs at T^{*}, which is tens of degrees Kelvin higher than the structural transition temperature T_{S}. …”
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