Dzyaloshinsky-Moriya Anisotropy in the Spin-1/2 Kagom\'e Compound ZnCu$_{3}$(OH)$_{6}$Cl$_{2}$

TL;DR

This paper determines the Dzyaloshinsky-Moriya interaction in a kagome spin-1/2 compound using ESR spectra, revealing its main component and the development of spin correlations at low temperatures.

Contribution

It provides the first detailed measurement of the Dzyaloshinsky-Moriya anisotropy in ZnCu₃(OH)₆Cl₂ using ESR analysis, highlighting its orientation and magnitude.

Findings

Main Dzyaloshinsky-Moriya component |D_z|=15(1) K perpendicular to kagome planes

Observation of spin-spin correlations developing below ~150 K

Identification of the dominant magnetic anisotropy term

Abstract

We report the determination of the Dzyaloshinsky-Moriya interaction, the dominant magnetic anisotropy term in the \kagome spin-1/2 compound {\herbert}. Based on the analysis of the high-temperature electron spin resonance (ESR) spectra, we find its main component $|D_z|=15(1)$ K to be perpendicular to the \kagome planes. Through the temperature dependent ESR line-width we observe a building up of nearest-neighbor spin-spin correlations below $\sim$150 K.