Phase Diagram and Spin Dynamics in Volborthite with a Distorted Kagome Lattice

Details Phase Diagram and Spin Dynamics in Volborthite with a Distorted Kagome Lattice Phase Diagram and Spin Dynamics in Volborthite with a Distorted Kagome Lattice

2009-06-16

arxiv.org/abs/0906.2846v2

Phys. Rev. Lett. 103 (2009) 077207

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.103.077207

We report 51V-NMR study on a high-quality powder sample of volborthite Cu3V2O7(OH)2/2H2O, a spin-1/2 Heisenberg antiferromagnet on a distorted kagome lattice formed by isosceles triangles. In the magnetic fields below 4.5 T, a sharp peak in the nuclear spin-lattice relaxation rate 1/T1 accompanied with line broadening revealed a magnetic transition near 1 K. The low temperature phase shows anomalies such as a Lorentzian line shape, a 1/T1 propto T behavior indicating dense low energy excitations, and a large spin-echo decay rate 1/T2 pointing to unusually slow fluctuations. Another magnetic phase appears above 4.5 T with less anomalous spectral shape and dynamics.

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