Abstract
Measurements of the frequency dependent susceptibility of ruby at liquid helium temperatures show that at certain harmonic fields the thermal equilibrium within the system of the Cr3+ single ions (S=3/2) is established by two steps. At first, two-spin cross-relaxation processes bring three Cr3+ levels into equilibrium. The fourth level then thermalizes with the former ones by means of much slower three-spin processes. The susceptibility of the spin system after the first equilibrium step, calculated within the framework of generalized thermodynamics, agrees excellently with the experimental results with regard to both magnitude and to temperature dependence.
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