Solitonic spin-liquid state due to the violation of the Lifshitz condition in Fe${}_{1+y}$Te

Abstract

A combination of phenomenological analysis and Mössbauer spectroscopy experiments on the tetragonal Fe${}_{1+y}$Te system indicates that the magnetic ordering transition in compounds with higher Fe-excess, $y\ge$ 0.11, is unconventional. Experimentally, a liquid-like magnetic precursor with quasi-static spin-order is found from significantly broadened Mössbauer spectra at temperatures above the antiferromagnetic transition. The incommensurate spin-density wave (SDW) order in Fe${}_{1+y}$Te is described by a magnetic free energy that violates the weak Lifshitz condition in the Landau theory of second-order transitions. The presence of multiple Lifshitz invariants provides the mechanism to create multidimensional, twisted, and modulated solitonic phases.

5 pages, 2 figures

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• First-Order Reversal Curves of the Magnetostructural Phase Transition in FeTe
• Pressure-induced ferromagnetism due to an anisotropic electronic topological transition in Fe1.08Te
• Magnetic surface reconstruction in the van-der-Waals antiferromagnet Fe${}_{1+x}$Te
• Investigation of magnetic phases in parent compounds of Iron-chalcogenides via quasiparticle scattering interference
• Confinement and moduli locking of Alice strings and monopoles
• Acoustic lattice instabilities at the magneto-structural transition in Fe${}_{1.057(7)}$Te