Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2005-12-24
J. Phys. Soc. Jpn. 74, Suppl., 75 (2005)
Physics
Condensed Matter
Strongly Correlated Electrons
8 pages, 5 figures
Scientific paper
Nuclear spin-lattice relaxation in one-dimensional Heisenberg ferrimagnets is studied by means of a modified spin-wave theory. Calculating beyond the first-order mechanism, where a nuclear spin directly interacts with spin waves through the hyperfine coupling, we demonstrate that the exchange-scattering-enhanced three-magnon nuclear relaxation may generally predominate over the Raman one with increasing temperature and decreasing field. Recent proton spin-lattice relaxation-time (T_1_) measurements on the ferrimagnetic chain compound NiCu(C_7_H_6_N_2_O_6_)(H_2_O)_3_2H_2_O suggest that the major contribution to 1/T_1_ be made by the three-magnon scattering.
Hori Hiromitsu
Yamamoto Shoji
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