Quantum magnetism in the paratacamite family: towards an ideal kagomé lattice.
Phys Rev Lett
; 98(7): 077204, 2007 Feb 16.
Article
em En
| MEDLINE
| ID: mdl-17359056
ABSTRACT
We report muon spin rotation measurements on the S=1/2 (Cu2+) paratacamite ZnxCu4-x(OH)6Cl2 family. Despite a Weiss temperature of approximately -300 K, the x=1 compound is found to have no transition to a magnetic frozen state down to 50 mK as theoretically expected for the kagomé Heisenberg antiferromagnet. We find that the limit between a dynamical and a partly frozen ground state occurs around x=0.5. For x=1, we discuss the relevance to a singlet picture.
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2007
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Article