Abstract
The relaxation of nuclei of radioactive 54Mn in crystals of lanthanum magnesium nitrate is studied as a function of Ce concentration, magnetic field and temperature. The nuclear orientation is derived from the γ-ray anisotropy. Nuclear spin-lattice relaxation times of 10 1 to 10 5s were measured and interpreted by electronic spin-lattice relaxation in conjunction with forbidden transitions, i.e. nuclear spin flips. Generally a Ce concentration of more than 1% is required in order to influence this relaxation significantly. When the sample is cooled at a fast rate, the Ce spins can induce forbidden transitions ( e.g. Sz = − 5 2 , Iz = +3 → Sz = − 3 2 , Iz = +2 ) in the Mn spin system, which proces generates a population of the nuclear levels which strongly deviates from thermal equilibrium as was shown by the observation of anomalous nuclear orientation. An analysis of this process is given.
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