title: The influence of the structural transition on magnetic fluctuations in NaFeAs.
abstract: NaFeAs belongs to a class of Fe-based superconductors which have parent compounds that show separated structural and magnetic transitions. Effects of the structural transition on spin dynamics therefore can be investigated separately from the magnetic transition. A plateau in dynamic spin response is observed in a critical region around the structural transition temperature T S. It is interpreted as being due to the stiffening of spin fluctuations along the in-plane magnetic hard axis due to the d xz and d yz orbital ordering. The appearance of anisotropic spin dynamics in the critical region above the T S at T (*) offers a dynamic magnetic scattering mechanism for anisotropic electronic properties in the commonly referred 'nematic phase'.
authors.affiliation: Department of Physics, Renmin University of China, Beijing 100872, People's Republic of China.
authors.forename: Juanjuan
authors.initials: J
authors.lastname: Liu
authors.forename: Jinchen
authors.initials: J
authors.lastname: Wang
authors.forename: Wei
authors.initials: W
authors.lastname: Luo
authors.forename: Jieming
authors.initials: J
authors.lastname: Sheng
authors.forename: Aifeng
authors.initials: A
authors.lastname: Wang
authors.forename: Xianhui
authors.initials: X
authors.lastname: Chen
authors.forename: Sergey A
authors.initials: SA
authors.lastname: Danilkin
authors.forename: Wei
authors.initials: W
authors.lastname: Bao