Orbital Order and Spin Nematicity in the Tetragonal Phase of Electron-doped Iron-Pnictides NaFe${}_{1-x}$Co${}_x$As

R. Zhou, L. Y. Xing, X. C. Wang +2

In copper-oxide and iron-based high temperature (high-$T_{\mathrm{c}}$) superconductors, many physical properties exhibit in-plane anisotropy, which is believed to be caused by a rotati…