%0 Journal Article
%T Mixed-State Effect on the Low-Energy Spin Dynamics in Optimally-doped Iron Pnictide Superconductors
%A Yi Gao
%A Tao Zhou
%A Huaixiang Huang
%A C. S. Ting
%A Peiqing Tong
%J Physics
%D 2013
%I arXiv
%R 10.1016/j.physc.2014.03.024
%X Based on a phenomenological model with $s_{\pm}$ or s-wave pairing symmetry, the mixed-state effect on the low-energy spin dynamics in optimally-doped iron pnictide superconductors is studied by solving Bogoliubov-de Gennes equations. Our results of the spin susceptibility at $\mathbf{q}=\mathbf{Q}$ in the normal, superconducting and mixed states agree qualitatively with recent neutron scattering experiments. We also propose that the field-induced intensity change shows different behaviors between the $s_{\pm}$ and s-wave symmetries in both momentum and real space, thus it can be used to distinguish these two pairing symmetries.
%U http://arxiv.org/abs/1303.1557v1