Theory of Electron Nematic Order in LaOFeAs

Details Theory of Electron Nematic Order in LaOFeAs Theory of Electron Nematic Order in LaOFeAs

2008-04-24

arxiv.org/abs/0804.3843v1

Phys. Rev. B 77 224509 (2008).

Physics

Condensed Matter

Strongly Correlated Electrons

3 figures, 6 pages

Scientific paper

10.1103/PhysRevB.77.224509

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, and then to a low temperature spin ordered phase. Identifying phases by their broken symmetries, these phases correspond precisely to the sequence of structural (tetragonal to monoclinic) and magnetic transitions that have been recently revealed in neutron scattering studies of LaOFeAs. The structural transition can thus be identified with the existence of incipient (``fluctuating'') magnetic order.

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