Classical Spin Liquid Instability Driven by Off-Diagonal Exchange in Strong Spin-Orbit Magnets

Ioannis Rousochatzakis, Natalia B. Perkins

Research output: Contribution to journalArticlepeer-review

51 Scopus citations

Abstract

We show that the off-diagonal exchange anisotropy drives Mott insulators with strong spin-orbit coupling to a classical spin liquid regime, characterized by an infinite number of ground states and Ising variables living on closed or open strings. Depending on the sign of the anisotropy, quantum fluctuations either fail to lift the degeneracy down to very low temperatures, or select noncoplanar magnetic states with unconventional spin correlations. The results apply to all 2D and 3D tricoordinated materials with bond-directional anisotropy and provide a consistent interpretation of the suppression of the x-ray magnetic circular dichroism signal reported recently for β-Li2IrO3 under pressure.

Original languageEnglish (US)
Article number147204
JournalPhysical review letters
Volume118
Issue number14
DOIs
StatePublished - Apr 5 2017

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