Bicollinear Antiferromagnetic Order, Monoclinic Distortion, and Reversed Resistivity Anisotropy in FeTe as a Result of Spin-Lattice Coupling

Abstract

The bicollinear antiferromagnetic order experimentally observed in FeTe is shown to be stabilized by the coupling ${\tilde{g}}_{12}$ between monoclinic lattice distortions and the spin-nematic order parameter with $B_{2g}$ symmetry, within a three-orbital spin-fermion model studied with Monte Carlo techniques. A finite but small value of ${\tilde{g}}_{12}$ is required, with a concomitant lattice distortion compatible with experiments, and a tetragonal-monoclinic transition strongly first order. Remarkably, the bicollinear state found here displays a planar resistivity with the "reversed" puzzling anisotropy discovered in transport experiments.Orthorhombic distortions are also incorporated and phase diagrams interpolating between pnictides and chalcogenides are presented. We conclude that the spin-lattice coupling discussed here is sufficient to explain the challenging properties of FeTe.

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• Competing spin density wave, collinear, and helical magnetism in Fe1+xTe
• First-Order Reversal Curves of the Magnetostructural Phase Transition in FeTe
• Density Matrix Renormalization Group Study of Nematicity in Two Dimensions: Application to a Spin-$1$ Bilinear-Biquadratic Model on the Square Lattice
• Interfacial phase frustration stabilizes unconventional skyrmion crystals
• Possible Bicollinear Nematic State with Monoclinic Lattice Distortions in Iron Telluride Compounds
• Plaquette instability competing with bicollinear ground state in detwinned FeTe
• Polaron and bipolaron tendencies in a semiclassical model for hole-doped bismuthates
• Spin-isotropic continuum of spin excitations in antiferromagnetically ordered Fe${}_{1.07}$Te
• Interplay between nematic fluctuation and superconductivity in the two-orbital Hubbard model: A quantum Monte Carlo study
• Emergent Ising degrees of freedom above double-stripe magnetism