Quantum magnetism in the paratacamite family: towards an ideal kagomé lattice.
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.
Mendels
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P
Laboratoire de Physique des Solides, UMR CNRS 8502, Université Paris-Sud, 91405 Orsay, France.
Bert
F
F
de Vries
M A
MA
Olariu
A
A
Harrison
A
A
Duc
F
F
Trombe
J C
JC
Lord
J S
JS
Amato
A
A
Baines
C
C