Field-Induced Magnetization in Ferromagnetic and Antiferromagnetic Alternating Heisenberg Chains Formed in (CH_3)_2CHNH_3CuCl_3 : Condensed Matter: Electronic Properties, etc.

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We report measurements of the magnetization process of the gap system (CH_3)_2CHNH_3CuCl_3, in which ferromagnetic-dominant ferromagnetic and antiferromagnetic alternating Heisenberg chains are formed and then a pair of ferromagnetically coupled S=1/2 spins behaves as a spin of S = 1. The two critical fields H_<c1> and H_<c2>, corresponding to the elimination of the energy gap and the alignment of all the spins along the direction of an external field H, are detected at 10.4 T and around 44 T, respectively, on a scale of the reduced magnetic field gH/2. These values are, in principle, consistent with those estimated from the analysis of the magnetic susceptibility. The critical exponents in the formula such as M(H) ∝ (H - H_<c1>)^<1/(δ_1)> and 1 - M(H) ∝ (H_<c2> - H)^<1/(δ_2)> are found to be δ_1 > 1 and δ_2 > 1.
社団法人日本物理学会の論文
2000-03-15