Z2-vortex order of frustrated Heisenberg antiferromagnets in two dimensions

TL;DR

This paper reviews recent experimental findings on frustrated two-dimensional Heisenberg antiferromagnets through the lens of Z2-vortex order, highlighting its relevance across various lattice types and spin magnitudes.

Contribution

It introduces the concept of Z2-vortex order as a unifying framework to interpret experimental data on frustrated 2D Heisenberg antiferromagnets.

Findings

Evidence of Z2-vortex order in multiple materials

Correlation between Z2-vortex phenomena and experimental observations

Potential universality of Z2-vortex behavior in frustrated systems

Abstract

We discuss the recent experimental data on various frustrated quasi-two-dimensional Heisenberg antiferromagnets from the viewpoint of the Z2-vortex order, which include S=3/2 triangular-lattice antiferromagnet NaCrO2, S=1 triangular-lattice antiferromagnet NiGa2S4, S=1/2 organic triangular-lattice antiferromagnets \kappa-(BEDT-TTF)2Cu2(CN)3 and EtMe3Sb[Pd(dmit)2]2, and S=1/2 kagome-lattice antiferromagnet volborthite Cu3V2O7(OH)22H2O, etc.