Theory of electron nematic order in LaFeAsO
Theory of electron nematic order in LaFeAsO
We study a spin $S$ quantum Heisenberg model on the Fe lattice of the rare-earth oxypnictide superconductors. Using both large $S$ and large $N$ methods, we show that this model exhibits a sequence of two phase transitions: from a high-temperature symmetric phase to a narrow region of intermediate ``nematic'' phase, …