Spin dynamics in the S =1/2 kagome compound vesignieite, Cu3Ba(VO5H)2
Ross H Colman, Fabrice Bert, David Boldrin, Adrian D Hillier, Laurent, C Chapon, Pascal Manuel, Phillipe Mendels, Andrew S Wills
TL;DR
This study investigates the spin behavior of high-quality vesignieite, a S=1/2 kagome antiferromagnet, revealing a quantum state with coexisting dynamic and frozen moments below 9 K, likely stabilized by Dzyaloshinsky-Moriya interactions.
Contribution
It provides detailed experimental evidence of a novel quantum ground state in vesignieite, highlighting the role of Dzyaloshinsky-Moriya interactions in stabilizing this state.
Findings
No long-range magnetic order detected
A kink in susceptibility at 9 K indicating a change in spin dynamics
Coexistence of dynamic and frozen magnetic moments below 9 K
Abstract
We report the study of high quality samples of the frustrated S = 1/2 kagome antiferromagnet vesignieite, Cu3Ba(VO5H)2. Neutron powder diffraction measurements evidence the high quality of the kagome lattice and show no sign of a transition to long-range order. A kink in the susceptibility below T = 9 K is matched to a reduction in paramagnetic-like correlations in the diffraction data and a slowing of the spin dynamics observed by MuSR. Our results point to an exotic quantum state below 9 K with coexistance of both dynamical and small frozen moments \sim 0.1 \muB. We propose that Dzyaloshinsky-Moriya interaction is large enough in this system to stabilize this novel quantum ground state.
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