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QUANTUM MECHANICS OF SIMPLE
THE MOLECULAR FIELD THEORY
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A-B interaction a-r curves absolute zero angular momentum anisotropy antiferromagnetic antiferromagnetic ordering antiparallel arrangement B-P-W method behavior body-centered cubic body-centered cubic lattice Brillouin function C/NKZ calculated Chapter consider constant coupling approximation constant coupling method corresponding crystal Curie point Curie temperature Curie-Weiss law discussion effective field theories eigenvalues equations exchange interactions experimental data face-centered cubic face-centered cubic lattice ferrites ferromagnetic fli fli Hamiltonian Heisenberg model high temperature susceptibility internal energy ions Kasteleijn kind of magnetic kind of ordering Kranendonk low temperatures magnetic atoms magnetic moments magnetic ordering magnetic properties molecular field theory molecular field treatment Neel point Neel temperature negative non-collinear obtained occur Oguchi method paramagnetic perpendicular Phys plane predicts reduced magnetization saturation second nearest neighbors short range order shown in Figure solution specific heat spin wave spontaneous magnetization sublattice temperature dependence transition temperature two-sublattice values Weiss field Weiss molecular field Weiss theory