Modified spin-wave description of the nuclear spin relaxation in ferrimagnetic Heisenberg chains

Details Modified spin-wave description of the nuclear spin relaxation in ferrimagnetic Heisenberg chains Modified spin-wave description of the nuclear spin relaxation in ferrimagnetic Heisenberg chains

2000-04-18

arxiv.org/abs/cond-mat/0004297v1

Physics

Condensed Matter

Statistical Mechanics

7 pages, 6 figures embedded, to appear in J. Phys. Soc. Jpn. Vol.69 No.7

Scientific paper

10.1143/JPSJ.69.2324

We make a modified spin-wave description of the nuclear spin relaxation in Heisenberg alternating-spin chains with antiferromagnetic exchange coupling. In contrast with the conventional one-dimensional antiferromagnetic spin-wave theory, which is plagued with the divergence of the sublattice magnetization even in the ground state, the present spin-wave description is highly successful over a wide temperature range. The temperature dependence of the relaxation rate $T_1^{-1}$ significantly varies with the crystalline structure, exhibiting both ferromagnetic and antiferromagnetic aspects. $T_1^{-1}$ further shows a unique dependence on the applied field, which turns out an indirect observation of the quadratic dispersion relations.

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