Magnetic Properties of S = 1/2 Heisenberg Chains with Bond Alternation and Randomness on the Strong Bonds
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概要
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The S = 1/2 Heisenberg chains with bond alternation and randomness on the strong bonds are studied by the density matrix renormalization group method. It is assumed that the odd-th bond is antiferromagnetic with strength J and the even-th bond can take the values J_A and J_F (J_A > J > 0 > J_F) randomly. The ground state of this model interpolates between the Haldane and dimer phases via a randomness dominated intermediate phase. On the basis of the scaling of the low energy spectrum and mean field treatment of the interchain coupling, we find that the magnetic long range order is induced by randomness in the intermediate regime. In the magnetization curves, there appears a plateau at the fractional value of the saturated magnetization. The fine structures of the magnetization curves and low energy spectrum are understood using the cluster picture. The relation to the recent experiment for (CH_3)_2CHNH_3Cu(Cl_xBr_<1-x>)_3 is discussed.
- 理論物理学刊行会の論文
- 2002-06-28
著者
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Hida K
Saitama Univ. Saitama
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Hida Kazuo
Department Of Physics Faculty Of Science Saitama University
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Hida Kazuo
Department Of Engineering Science Faculty Of Engineering Hokkaido University
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HIDA Kazuo
Department of Physics, Saitama University
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HIDA Kazuo
Department of Physics, University of Tokyo
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