Abstract
To take the intra-site spin magnitude fluctuation into account, the usual one-spin per site Heisenberg Hamiltonian is extended to two interacting spins per site. We have studied the magnetization and susceptibility of the model Hamiltonian as function of temperature and coupling constants using the double-time Green's function method. In contrast to the one-spin per site Heisenberg Hamiltonian where the Curie constant depends only on the resultant saturated magnetic moment, our results show that Curie constant of the two-spin per site Heisenberg model depends rather on the individual moments. Thus, the Curie constant can have finite value even when the resultant saturated magnetic moment vanishes. The possible physical implication of our result is also discussed.
Published Version
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