Observation of orbital ordering and origin of the nematic order in FeSeCao R.,
Hu J.,
Dong J.,
Zhang J.,
Ye X.,
Xu Y.,
Chareev D.,
Vasiliev A.,
Wu B.,
Zeng X.,
Wang Q.,
Wu G. -lattice relaxation gradually developed starting at ∼40
K, which is far below the nematic order temperature T nem = 89