Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 78, Issue 4, Pages -Publisher
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.78.043704
Keywords
kagome lattice; spin liquid; magnetization step; volborthite
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Funding
- Grant-in-Aids for Scientific Research [19052003, 451]
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Magnetic properties of the spin-1/2 kagome-like compound volborthite are studied using a high-quality polycrystalline sample. It is evidenced from magnetization and specific heat measurements that the spins on the kagome lattice Still fluctuate at low temperature, down to T = 60 mK that corresponds to 1/1500 of the nearest-neighbor antiferromagnetic interaction, exhibiting neither a conventional long-range order nor a spin gap. In contrast, V-51 NMR experiments revealed a sharp peak at 1 K in relaxation rate, which indicates that a certain exotic order Occurs. Surprisingly, we have observed three steps in magnetization as a function of magnetic field, suggesting that at least four liquid-like or other quantum states exist under magnetic fields.
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