Abstract
We present a theoretical and experimental study of aquasi-one-dimensional zigzag antiferromagnet (N2H5)CuCl3,which can be viewed as weakly coupled Heisenberg chains with a frustratedinteraction. We first discuss generic features of the magnetic properties of thezigzag spin chain between the nearly single chain case and the nearly double chaincase, on the basis of the finite temperature density-matrix renormalization group(DMRG) calculations. We next show the experimental results for the magneticsusceptibility and the high-field magnetization of a single crystal of (N2H5)CuCl3above the Néel temperature TN = 1.55 K.By comparing the experimental data with the DMRG results carefully, we finallyobtain the ratio of the nearest and next-nearest exchange couplings asJ1/J2 = 0.25with J2/kB = 16.3 K.We also investigate the three-dimensional (3D) couplingJ′ effect byusing mean-field theory combined with the DMRG calculations. The estimated value J′ ∼ 0.04J2supports the one-dimensionality of (N2H5)CuCl3above TN.
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