Magnetic Order in the Spin-1/2 Kagome Antiferromagnet Vesignieite
Makoto Yoshida, Yoshihiko Okamoto, Masashi Takigawa, Zenji Hiroi
TL;DR
This study investigates the magnetic properties of vesignieite, a candidate spin-1/2 kagome antiferromagnet, revealing a two-step magnetic transition and a specific magnetic structure at low temperatures.
Contribution
It provides detailed experimental evidence of magnetic ordering and structure in vesignieite, a key candidate for quantum spin liquid studies, using NMR and susceptibility measurements.
Findings
Two-step magnetic transition at 13 K and 9 K
Q=0 magnetic structure with 120-degree spin arrangement
Ordered moments of at least 0.6 μB
Abstract
We report results of magnetic susceptibility and 51V- and 63,65Cu-NMR measurements on a high-quality powder sample of vesignieite BaCu3V2O8(OH)2, a candidate for the spin-1/2 kagome antiferromagnet. We observed a twostep magnetic transition: the appearance of spatially inhomogeneous static moments below 13 K and a long-range order below 9 K. The NMR data indicate a Q = 0 magnetic structure at 1.4 K with the in-plane spin components of three sublattices oriented at nearly 120 degrees to each other and the magnitude of the ordered moments of at least 0.6 muB
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