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Approximation of Magnetic Lattice Models in Real
Examples of Simple Magnetic Model Systems en Real
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2-d Heisenberg 2-d Ising agreement anisotropy antiferro approximation axis Birgeneau calculated cm3/mole CoCl2 compared compounds Conf correlation CrBr3 critical behaviour critical exponents curve derived dimensionality dipolar discussed diverges Domb effects energy estimate examples exchange constant expected experimental experiments FeCl2 ferromagnetic finite Fisher Friedberg heat capacity Heisenberg antiferromagnet Heisenberg chain Heisenberg model high-temperature Hirakawa ideal interlayer coupling ions Ising model isotropic J'jJ Jongh layers long-range order low-temperature Magn magnon maximum MF theory Miedema MnF2 nearest neighbours neutron diffraction observed obtained orthorhombic paramagnetic parameters perpendicular susceptibility phase diagram phase transition phonon Phys planar Heisenberg plane Proc quadratic quantity RbMnF3 respectively salts scattering series expansion shown in fig specific heat spin value spin waves spin-flop spin-wave theory spontaneous magnetization structure susceptibility measurements temperature dependence thermodynamic tion TjTc transition temperature transition to long-range whereas Wielinga XY model zero-point spin deviations