Abstract
Pristine Co c Mg 1-c Cl 2 and stage-2 Co c Mg 1-c Cl 2 graphite intercalation compounds (GICs) (0≤c≤1) approximate site-diluted three-dimensional (3D) and two-dimensional (2D) XY spin systems, respectively. We have studied the magnetic phase transitions of these two systems by using dc and ac magnetic susceptibilities. We find that the reduced critical temperature of stage-2 Co c Mg 1-c Cl 2 GIC is almost the same as that of Co c Mg 1-c Cl 2 for c>0.7. The effect of the dimensionality on the dilution with Mg ions becomes significant below c≃0.7
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