Vesignieite BaCu3V2O8(OH)2 as a Candidate Spin-1/2 Kagome Antiferromagnet
- 15 March 2009
- journal article
- letter
- Published by Physical Society of Japan in Journal of the Physics Society Japan
- Vol. 78 (3)
- https://doi.org/10.1143/jpsj.78.033701
Abstract
A polycrystalline sample of vesignieite BaCu 3 V 2 O 8 (OH) 2 comprising a nearly ideal kagome lattice composed of Cu 2+ 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 J / k B =53 K between nearest-neighbor spins. A broad peak observed at a temperature corresponding to 0.4 J 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 ∼ J /30.Keywords
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