TY - JOUR

T1 - Magnetic properties of a S = 1/2 zigzag spin chain compound (N2H5)CuCl3

AU - Maeshima, N.

AU - Hagiwara, M.

AU - Narumi, Y.

AU - Kindo, K.

AU - Kobayashi, T. C.

AU - Okunishi, K.

PY - 2003/6/4

Y1 - 2003/6/4

N2 - Large-scale Computational Science Division, Cybermedia Centre, Osaka University 1-32 Machikaneyamacho, Toyonaka, Osaka 560-0043, JapanWe present a theoretical and experimental study of a quasi-one-dimensional zigzag antiferromagnet (N2H5)CuCl3, which can be viewed as weakly coupled Heisenberg chains with a frustrated interaction. We first discuss generic features of the magnetic properties of the zigzag spin chain between the nearly single chain case and the nearly double chain case, on the basis of the finite temperature density-matrix renormalization group (DMRG) calculations. We next show the experimental results for the magnetic susceptibility and the high-field magnetization of a single crystal of (N2H5)CuCl3 above the Néel temperature TN = 1.55 K. By comparing the experimental data with the DMRG results carefully, we finally obtain the ratio of the nearest and next-nearest exchange couplings as J1/2 = 0.25 with J2/kB = 16.3K. We also investigate the three-dimensional (3D) coupling J′ effect by using mean-field theory combined with the DMRG calculations. The estimated value J′ ∼ 0.04 J2 supports the one-dimensionality of (N2H5)CuCl3 above TN.

AB - Large-scale Computational Science Division, Cybermedia Centre, Osaka University 1-32 Machikaneyamacho, Toyonaka, Osaka 560-0043, JapanWe present a theoretical and experimental study of a quasi-one-dimensional zigzag antiferromagnet (N2H5)CuCl3, which can be viewed as weakly coupled Heisenberg chains with a frustrated interaction. We first discuss generic features of the magnetic properties of the zigzag spin chain between the nearly single chain case and the nearly double chain case, on the basis of the finite temperature density-matrix renormalization group (DMRG) calculations. We next show the experimental results for the magnetic susceptibility and the high-field magnetization of a single crystal of (N2H5)CuCl3 above the Néel temperature TN = 1.55 K. By comparing the experimental data with the DMRG results carefully, we finally obtain the ratio of the nearest and next-nearest exchange couplings as J1/2 = 0.25 with J2/kB = 16.3K. We also investigate the three-dimensional (3D) coupling J′ effect by using mean-field theory combined with the DMRG calculations. The estimated value J′ ∼ 0.04 J2 supports the one-dimensionality of (N2H5)CuCl3 above TN.

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U2 - 10.1088/0953-8984/15/21/309

DO - 10.1088/0953-8984/15/21/309

M3 - Article

AN - SCOPUS:0037708535

VL - 15

SP - 3607

EP - 3618

JO - Journal of Physics Condensed Matter

JF - Journal of Physics Condensed Matter

SN - 0953-8984

IS - 21

ER -