Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2000-12-19
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages, 5 figures embedded, Solid State Commun. 117, No. 1 (2000)
Scientific paper
10.1016/S0038-1098(00)00414-2
In response to recent nuclear-magnetic-resonance measurements on a ferrimagnetic chain compound NiCu(C_7H_6N_2O_6)(H_2O)_3 2H_2O [Solid State Commun. {\bf 113} (2000) 433], we calculate the nuclear spin-lattice relaxation rate 1/T_1 in terms of a modified spin-wave theory. Emphasizing that the dominant relaxation mechanism arises from the direct (single-magnon) process rather than the Raman (two-magnon) one, we explain the observed temperature and applied-field dependences of 1/T_1. Ferrimagnetic relaxation phenomena are generally discussed and novel ferrimagnets with extremely slow dynamics are predicted.
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