Two kagome compounds, volborthite Cu3V2O7(OH)2-2H2O and herbertsmithite ZnCu3(OH)6Cl2, are compared in order to derive information about the intrinsic properties of the spin-1/2 kagome antiferromagnet. Volborthite shows a broad maximum at T ~ J / 4 and the approach at T = 0 to a large finite value of the bulk magnetic susceptibility chi_bulk as well as the local susceptibility chi_local from NMR measurements. These must be intrinsic properties for the spin-1/2 kagome antiferromagnet, as similar behavior has also been reported in chi_local for herbertsmithite [Olariu A et al. 2008 Phys. Rev. Lett., 100 087202]. Impurity effects that may significantly influence the bulk properties are discussed.
Cite
@article{arxiv.0810.4202,
title = {Spin-1/2 kagome compounds: volborthite vs herbertsmithite},
author = {Z Hiroi and H Yoshida and Y Okamoto and M Takigawa},
journal= {arXiv preprint arXiv:0810.4202},
year = {2009}
}
Comments
8 pages, to be published in J. Phys.: Conf. Series; Proc. of HFM2008