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arXiv · 1704.03495

Possible Bicollinear Nematic State with Monoclinic Lattice Distortions in Iron Telluride Compounds

C. B. Bishop·J. Herbrych·E. Dagotto·A. Moreo
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Abstract

Iron telluride FeTe is known to display bicollinear magnetic order at low temperatures together with a monoclinic lattice distortion. Because the bicollinear order can involve two different wavevectors $(π/2,π/2)$ and $(π/2,-π/2)$, symmetry considerations allow for the possible stabilization of a nematic state with short-range bicollinear order coupled to monoclinic lattice distortions at a $T_S$ higher than the temperature $T_N$ where long-range bicollinear order fully develops. As a concrete example, the three-orbitals spin-fermion model for iron telluride is studied with an additional coupling $\tildeλ_{12}$ between the monoclinic lattice strain and an orbital-nematic order parameter with $B_{2g}$ symmetry. Monte Carlo simulations show that with increasing $\tildeλ_{12}$ the first-order transition characteristic of FeTe splits and bicollinear nematicity is stabilized in a (narrow) temperature range. In this new regime the lattice is monoclinically distorted and short-range spin and orbital order breaks rotational invariance. A discussion of possible realizations of this exotic state is provided.

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C. B. Bishop, J. Herbrych, E. Dagotto, A. Moreo. 2017-07-24. Possible Bicollinear Nematic State with Monoclinic Lattice Distortions in Iron Telluride Compounds. https://doi.org/10.1103/physrevb.96.035144

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