Raman scattering study of tetragonal magnetic phase in Sr${}_{1-x}$Na${}_x$Fe${}_2$As${}_2$: structural symmetry and electronic gap

Li Yue, Xiao Ren, Tingting Han +4

We use inelastic light scattering to study Sr${}_{1-x}$Na${}_x$Fe${}_2$As${}_2$ ($x\approx 0.34$), which exhibits a robust tetragonal magnetic phase that restores the four-fold rotation sym…