Temperature Dependence of the Paramagnetic Resonance Line-widths in RbNiF_3 and RbMnF_3

概要

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Temperature dependences of the paramagnetic resonance line-widths ΔH of ferrimagnetic (very nearly ferromagnetic) RbNiF_3 and antiferromagnetic RbMnF_3 have been observed in order to investigated the dynamics of the spin fluctuation near the critical points. Reflecting the importance of the anisotropy energy, by which the damping of K=0 transverse mode is influenced, no anomalous increase in widths occurs in isotropic antiferromagnet RbMnF_3 on passing through the critical point. But in the case of uniaxial ferrimagnet RbNiF_3, great narrowing of the width occurs with decreasing temperatures. The width is minimum at (1.025∼1.035)T_c and increases slightly with further decreasing temperatures. The product ΔH・x_⊥, where x_⊥ is the perpendicular susceptibilty, shows almost exactly the same temperature variation as that of MnF_2 with the critical exponent -2/3, supporting the theory of Mori and Kawasaki pretty well.
社団法人日本物理学会の論文
1971-03-02