Magnetization "Steps" on a Kagome Lattice in Volborthite

Details Magnetization "Steps" on a Kagome Lattice in Volborthite Magnetization "Steps" on a Kagome Lattice in Volborthite

2009-02-18

arxiv.org/abs/0902.3028v2

J. Phys. Soc. Jpn. 78 (2009) 043704.

Physics

Condensed Matter

Strongly Correlated Electrons

J. Phys. Soc. Jpn, Vol.78, No.4 (2009), in press

Scientific paper

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, 51V 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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