Vesignieite BaCu3V2O8(OH)2 as a Candidate Spin-1/2 Kagome Antiferromagnet

Yoshihiko Okamoto; Hiroyuki Yoshida; Zenji Hiroi

doi:10.1143/JPSJ.78.033701

Vesignieite BaCu3V2O8(OH)2 as a Candidate Spin-1/2 Kagome Antiferromagnet

Strongly Correlated Electrons 2009-11-13 v1 Materials Science

Authors: Yoshihiko Okamoto , Hiroyuki Yoshida , Zenji Hiroi

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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.

Keywords

kagome antiferromagnet spin liquid vesignieite magnetic susceptibility short-range order

Cite

@article{arxiv.0901.2237,
  title  = {Vesignieite BaCu3V2O8(OH)2 as a Candidate Spin-1/2 Kagome Antiferromagnet},
  author = {Yoshihiko Okamoto and Hiroyuki Yoshida and Zenji Hiroi},
  journal= {arXiv preprint arXiv:0901.2237},
  year   = {2009}
}

Comments

4 pages, 5 figures

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