Abstract
Neutron elastic and quasi-elastic scattering have been measured in homogeneously-mixed two-dimensional dilute antiferromagnets Rb 2 Co c Mg 1- c F 4 . The result gives a first observation of sharp phase transition at the Neel temperature irrespective of magnetic concentration c even near the percolation threshold. The magnetic correlation length near the Neel temperature increases as the concentration of magnetic Co ions decreases.
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