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Heterogeneous spin state in the field-induced phase of volborthite as seen via 51V nuclear magnetic resonance

By M. Yoshida, M. Takigawa, H. Yoshida, Y. Okamoto and Z. Hiroi

Abstract

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.Comment: 5 pages, 4 figure

Topics: Condensed Matter - Strongly Correlated Electrons
Year: 2011
DOI identifier: 10.1103/PhysRevB.84.020410
OAI identifier: oai:arXiv.org:1103.6137
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