期刊
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
卷 71, 期 3, 页码 948-954出版社
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.71.948
关键词
spin ice; geometrical frustration system; cluster variation method; cactus approximation
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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