Modified Spin-wave Description of the Nuclear Spin Relaxation in Ferrimagnetic Heisenberg Chains : Condensed Matter: Electronic Properties, etc.
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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, the present spin-wave description succeeds in completely avoiding the divergence of the boson numbers and is therefore satisfactory 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.
- 社団法人日本物理学会の論文
- 2000-07-15
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