Heterogeneous spin state in the field-induced phase of volborthite as   seen via 51V nuclear magnetic resonance
  We report results of 51V NMR in the field-induced phase of volborthite Cu3V2O7(OH)dot2H2O, a spin-1/2 antiferromagnet on a distorted kagome lattice. In magnetic fields above 4.5 T, two types of V sites with different spin-echo decay rates are observed. The hyperfine field at the fast decaying sites has a distribution, while it is more homogeneous at the slowly decaying sites. Our results indicate a heterogeneous state consisting of two spatially alternating Cu spin systems, one of which exhibits anomalous spin fluctuations contrasting with the other showing a conventional static order. 
M. Yoshida, M. Takigawa, H. Yoshida, Y. Okamoto, Z. Hiroi
cond-mat.str-el