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Title:
Vesignieite BaCu3V2O8(OH)2 as a Candidate Spin-1/2 Kagome Antiferromagnet
Authors:
Okamoto, Yoshihiko; Yoshida, Hiroyuki; Hiroi, Zenji 
Affiliation:
AA(Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581)
Publication:
Journal of the Physical Society of Japan, Volume 78, Issue 3, pp. 033701 (2009). (JPSJ Homepage)
Publication Date:
03/2009
Origin:
IPAP
DOI:
10.1143/JPSJ.78.033701
Bibliographic Code:
2009JPSJ...78c3701O

Abstract

A polycrystalline sample of vesignieite BaCu3V2O8(OH)2 comprising a nearly ideal kagome lattice composed of Cu2+ 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/kB=53 K between nearest-neighbor spins. A broad peak observed at a temperature corresponding to 0.4J 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.
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