Vacancy migration in the kagome ising ferromagnet

We report a theoretical study of the temperature-dependent magnetic contrib utions to the free enthalpy, entropy, and enthalpy of vacancy migration for a kagome ferromagnetic Ising system. The a priori knowledge of the exact s olutions of spin correlations for the perfect kagome structure enables us t o determine the thermodynamic functions at all temperatures. The entropy an d enthalpy diverge at the critical temperature T-c, whereas the free enthal py shows rapid change around the critical temperature and remains finite up to very high temperatures.