High-Field ESR Measurements of S=1/2 Kagome Lattice Antiferromagnet BaCu$_3$V$_2$O$_8$(OH)$_2$

TL;DR

This study uses high-field ESR to investigate the magnetic properties of vesignieite, a nearly ideal S=1/2 kagome antiferromagnet, revealing short-range order development and evidence for a gapless spin liquid ground state.

Contribution

It provides detailed high-field ESR measurements on vesignieite, highlighting its short-range magnetic order and gapless spin liquid behavior at low temperatures.

Findings

g-value and linewidth increase below 20 K

Evidence of short-range magnetic order

Indications of a gapless spin liquid ground state

Abstract

High-field electron spin resonance (ESR) measurements have been performed on vesignieite BaCu$_3$V$_2$O$_8$(OH)$_2$, which is considered as a nearly ideal model substance of $S$=1/2 kagome antiferromagnet, in the temperature region from 1.9 to 265 K. The frequency region is from 60 to 360 GHz and the applied pulsed magnetic field is up to 16 T. Observed g-value and linewidth show the increase below 20 K, which suggest the development of the short range order. Moreover, a gapless spin liquid ground state is suggested from the frequency-field relation at 1.9 K.