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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 CuCl2xBr2(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.
Ground state and elementary excitations of the S=1 kagome Hisenberg antiferromagnet
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