Nuclear spin relaxation in ordered bimetallic chain compounds
Abstract
A theoretical interpretation is given to recent proton spin relaxation-time (T1) measurements on NiCu(C7H6N2O6)(H2O)3·2H2O, which is an ideal one-dimensional ferrimagnetic Heisenberg model system of alternating spins 1 and 1/2. The relaxation rate T1-1 is formulated in temrs of the spin-wave theory and is evaluated by the use of a quantum Monte Carlo method. Calculations of the temperature and applied-field (H) dependences of T1-1 are in total agreement with the experimental findings. T1 behaves as T1-1 H-1/2, which turns out an indirect observation of the quadratic dispersion relations dominating the low-energy physics of quantum ferrimagnets.
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