Abstract
A systematic study of the dependence of the nuclear spin-lattice relaxation of 54Mn present as a dilute nuclear impurity in MnCl2.4H2O has been made below 1 K, using the technique of low-temperature nuclear orientation. Variation of T1 for the two antiferromagnetic sublattices is presented as a function of applied field and of temperature, in the region of the antiferromagnetic-spin-flop transition. The differing applied field dependences of T1 for the two magnetic sublattices whose electronic moments are respectively parallel and antiparallel (up and down) to the external field have been interpreted in terms of unequal transverse fluctuations of the electronic spin and spin-wave damping. For the temperature dependence, it is found that 1/T1 increases as Tn with n=1.40(2) and n=1.10(1) for the down and up sublattices respectively. It is shown that a simple spin-wave approach is inadequate to provide a quantitative description of the relaxation phenomena near the antiferromagnetic-spin-flop transition.
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