Makoto Yoshida, Yoshihiko Okamoto, Hiroyuki Yoshida, Masashi Takigawa, Zenji Hiroi
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 spin-1/2 Heisenberg antiferromagnet on a slightly distorted kagome lattice. We observed a two-step 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 low temperatures with the in-plane spin components of three sublattices oriented nearly at 120 degrees to each other and the magnitude of the ordered moments of at least 0.6 muB.
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http://arxiv.org/abs/1209.4693
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