Abstract

The determination of the heat contact η between a system of paramagnetic spins and the crystal lattice is discussed. The relation between the transient and the steady state method is shown to depend on the degree of internal spin equilibrium. The temperature and field dependences of η for concentrated salts as determined previously by the relaxation method are still unexplained. The influence of spin-spin interactions is considered, but can explain said dependences only when strong spin-spin interactions are present. The failure of the hot phonon theory for concentrated salts is explained on the base of the broadness of the spin spectrum over which energy exchange with the lattice vibrations can take place. The formulae used in the relaxation and the saturation method are for linear systems shown to become identical by a suitable transformation.

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