Abstract
The ground-state magnetic properties of the spin-1/2 quasi-kagome compound volborthite are discussed. Volborthite exhibits a peculiar phase transition to an unconventional ordered phase at 1 K. This phase is characterized by dense low-energy excitations and extremely slow spin fluctuations together with spin-wave like excitations, as evidenced by means of heat capacity and 51V NMR. To understand these features, we consider an exotic long-range order based on the 120° √3 × √3 spin structure, which allows local modes in the hexagons of the kagome lattice.
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