A number of experiments on magnetic insulating systems is reviewed which bear upon the following subjects: (i) the magnetic XY model, (ii) the quadratic Heisenberg magnet, (iii) magnetic double-layers, (iv) lattice-dimensionality crossovers, (v) singlet–ground state systems, (vi) magnetic systems doped with magnetic or nonmagnetic impurities.
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L.J. de Jongh (1978) studied this question.
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