Topological Thermal Hall Effect in Frustrated Kagomé Antiferromagnets

S. A. Owerre

doi:10.1103/PhysRevB.95.014422

paper

Topological Thermal Hall Effect in Frustrated Kagomé Antiferromagnets

arXiv:1608.04561 · doi:10.1103/PhysRevB.95.014422

Abstract

In frustrated magnets the Dzyaloshinsky-Moriya interaction arising from spin-orbit coupling can induce a magnetic long-range order. Here, we report a theoretical prediction of thermal Hall effect in frustrated kagomé magnets such as KCr $_{3}$ (OH) $_{6}$ (SO4) $_{2}$ and KFe $_{3}$ (OH) $_{6}$ (SO $_{4}$ ) $_{2}$ . The thermal Hall effects in these materials are induced by scalar spin chirality as opposed to DMI in previous studies. The scalar spin chirality originates from magnetic-field-induced chiral spin configuration due to non-coplanar spin textures, but in general it can be spontaneously developed as a macroscopic order parameter in chiral quantum spin liquids. Therefore, we infer that there is a possibility of thermal Hall effect in frustrated kagomé magnets such as herbertsmithite ZnCu $_{3}$ (OH) $_{6}$ Cl $_{2}$ and the chromium compound Ca $_{10}$ Cr $_{7}$ O $_{28}$ , although they also show evidence of magnetic order in the presence of a magnetic field or pressure.

arXiv comment6 pages, 5 figures. PRB Accepted

Topological Thermal Hall Effect in Frustrated Kagomé Antiferromagnets

Abstract

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