Impurity-Induced Ordered Phases in Quasi-One-Dimensional Spin-Gap Systems

The mixture of bond-alternating and uniform S = 1/2 antiferromagnetic Heisenberg chains is investigated by the density matrix renormalization group method. The ground state magnetization curve is calculated and the exchange parameters are determined by fitting to the experimentally measured magnetization curve of CuCl2xBr 2(1−x) (γ-pic)2 . The low field behavior of the magnetization curve and low temperature behavior of the magnetic susceptibility are found to be sensitive to whether the bond-alternation pattern (parity) is fixed all over the sample or randomly distributed. The both quantities are compatible with the numerical results for the random parity model.

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Random Magnetism inS=1/2 Heisenberg Chains with Bond Alternation and Randomness on the Strong Bonds

Hida

2003

J. Phys. Soc. Jpn.

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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 oddth bond is antiferromagnetic with strength J and even-th bond can take the values JA and JF (JA > J > 0 > JF) randomly. The ground state of this model interpolates between the Haldane and dimer phases via a randomness dominated intermediate phase. Based on the scaling of the low energy spectrum and mean field treatment of the interchain coupling, it is found 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 based on the cluster picture. The relation with the recent experiment for (CH3)2CHNH3Cu(ClxBr1−x)3 is discussed. =3 J A =4 J A =5 J A =6 Fig. 3. The q-dependence of ∆q. The inset shows the q-cluster.

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Impurity-Induced Ordered Phases in Quasi-One-Dimensional Spin-Gap Systems

Cited by 4 publications

References 27 publications

Chemistry of Quantum Spin Liquids

Chemistry of Quantum Spin Liquids

Ground State and Magnetization Process of the Mixture of Bond-Alternating and UniformS=1/2 Antiferromagnetic Heisenberg Chains

Random Magnetism inS=1/2 Heisenberg Chains with Bond Alternation and Randomness on the Strong Bonds

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