Vesignieite BaCu<SUB>3</SUB>V<SUB>2</SUB>O<SUB>8</SUB>(OH)<SUB>2</SUB> as a Candidate Spin-1/2 Kagome Antiferromagnet
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A polycrystalline sample of vesignieite BaCu<SUB>3</SUB>V<SUB>2</SUB>O<SUB>8</SUB>(OH)<SUB>2</SUB> comprising a nearly ideal kagome lattice composed of Cu<SUP>2+</SUP> ions carrying spin 1/2 has been synthesized and studied by magnetization and heat capacity measurements. Magnetic susceptibility shows a neither long range order, a spin glass transition nor a spin gap down to 2 K, in spite of a moderately strong antiferromagnetic interaction of <I>J</I>⁄<I>k</I><SUB>B</SUB>=53 K between nearest-neighbor spins. A broad peak observed at a temperature corresponding to 0.4<I>J</I> in intrinsic magnetic susceptibility indicates a marked development of the short-range order. The ground state of vesignieite is probably a gapless spin liquid or is accompanied by a very small gap less than ∼<I>J</I>⁄30.
- Journal of the Physical Society of Japan
Journal of the Physical Society of Japan 78(3), 033701-033701, 2009
THE PHYSICAL SOCIETY OF JAPAN