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

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

2011-03-31

arxiv.org/abs/1103.6137v2

Phys. Rev. B 84 (2011) 020410(R)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 figures

Scientific paper

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.

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