Application of the Cluster Variation Method to Spin Ice Systems on the Pyrochlore Lattice

Details Application of the Cluster Variation Method to Spin Ice Systems on the Pyrochlore Lattice Application of the Cluster Variation Method to Spin Ice Systems on the Pyrochlore Lattice

2001-11-12

arxiv.org/abs/cond-mat/0111219v1

Physics

Condensed Matter

Statistical Mechanics

8 pages, 7 figures

Scientific paper

10.1143/JPSJ.71.948

The cactus approximation in the cluster variation method is applied to the spin ice system with nearest neighbor ferromagnetic coupling. The temperature dependences of the entropy and the specific heat show qualitatively good agreement with those observed by Monte Carlo simulations and experiments, and the Pauling value is reproduced for the residual entropy. The analytic expression of the q-dependent magnetic susceptibility is obtained, from which the absence of magnetic phase transition is confirmed. The neutron scattering pattern is also evaluated and found to be consistent with that obtained from Monte Carlo simulations.

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