Journal
PHYSICAL REVIEW LETTERS
Volume 103, Issue 7, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.103.077207
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Funding
- G-COE program
- MEXT Japan [19052003]
- Grants-in-Aid for Scientific Research [21340093] Funding Source: KAKEN
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We report a V-51-NMR study on a high-quality powder sample of volborthite Cu3V2O7(OH)(2) center dot 2H(2)O, 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/T-1 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/T-1 alpha T behavior indicating dense low-energy excitations, and a large spin-echo decay rate 1/T-2 pointing to unusually slow fluctuations. Another magnetic phase appears above 4.5 T with less anomalous spectral shape and dynamics.
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