Dynamics in pure and substituted volborthite kagome-like compounds
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- 作者：F. Bert ; P. Mendels ; D. Bono ; A. Olariu ; F. Ladieu ; J.-C. Trombe ; F. Duc ; C. Baines ; A. Amato and A. Hillier
- 关键词：Muon-spin rotation ; Kagomé ; lattice ; Frustrated magnets
- 刊名：Physica B
- 出版年：2006
- 出版时间：31 March 2006
- 年：2006
- 卷：374-375
- 期：Complete
- 页码：134-137
- 全文大小：320 K
文摘
Volborthite Cu3V2O7(OH)2·2H2O is a natural frustrated antiferromagnet with a kagomé-like magnetic lattice decorated by spins. Our μSR results confirm the existence of a dynamical plateau below 2 K, as initially demonstrated in [Phys. Rev. Lett. 91 (2003) 207603] despite sensible quantitative differences in the relaxation rate values. Thanks to additional low temperature SQUID and NMR data we show that this plateau occurs concurrently with a freezing transition. Moreover, we revisited the effect of diluting the magnetic lattice for small dilution rates between 1 % and 15 % . Comparison is made with the well studied kagomé bilayer compounds. The ground state of volborthite appears to be far less stable with respect to dilution.