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首页> 外文期刊>Physical review >Hybridization of magnetic excitations between quasi-one-dimensional spin chains and spin dimers in Cu_3MO_2O_9 observed using inelastic neutron scattering
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Hybridization of magnetic excitations between quasi-one-dimensional spin chains and spin dimers in Cu_3MO_2O_9 observed using inelastic neutron scattering

机译：用非弹性中子散射观察到Cu_3MO_2O_9中准一维自旋链与自旋二聚体之间的磁激发杂交

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摘要

We have studied the exchange interactions and the hybridization effects of two kinds of magnetic excitations in Cu_3MO_2O_9 by using inelastic neutron scattering. This compound has two magnetic subsystems, i.e., the quasi-one-dimensional (qlD) antiferromagnetic (AF) spin system and the quantum spin dimers. We observe two branches in the magnetic excitations and obtain the magnetic parameters as follows. We evaluate the intrachain interaction J_4 - 4.0 meV in the qlD AF spin system and the intradimer interaction J_3 = 5.8 meV in the spin dimers. Applying the interchain mean-field theory (CMF) with the random-phase approximation (RPA), we estimate the mass gap of the qlD AF spin system as 1.2 meV. Using the CMF-RPA theory, the ferromagnetic interchain interaction between the magnetic chain along the a axis and the AF one between the magnetic chains at the center and the corner of the unit cell are estimated to be - J_a = J_(α β) =0.19 meV, respectively. The hybridization parameter, which represents the intersubsystem interaction, has the wave-vector dependence as E_(int), sin(πK), where E_(int) = 1.6 meV and kb* denotes the wave vector of magnetic excitation along the b* direction. The modulation of the molecular field generated by the magnetic excitation of the q 1D AF spin system plays an important role in this hybridization.
机译：利用非弹性中子散射研究了Cu_3MO_2O_9中两种磁激发的交换相互作用和杂交效应。该化合物具有两个磁性子系统，即准一维（qID）反铁磁性（AF）自旋系统和量子自旋二聚体。我们在磁激励中观察到两个分支，并按如下方式获得磁参数。我们在qlD AF自旋系统中评估链内相互作用J_4-4.0 meV，在自旋二聚体中评估二聚体内相互作用J_3 = 5.8 meV。应用链间平均场理论（CMF）和随机相位近似（RPA），我们估计qlD AF自旋系统的质量差为1.2 meV。使用CMF-RPA理论，沿a轴的磁链与单位晶胞中心和角处的磁链之间的AFone之间的铁磁链间相互作用估计为-J_a = J_（αβ）=分别为0.19 meV。表示子系统间相互作用的杂交参数具有波矢量相关性，即E_（int），sin（πK），其中E_（int）= 1.6 meV，kb *表示沿b *方向的磁激发的波矢量。由q 1D AF自旋系统的磁激发产生的分子场的调制在这种杂交中起重要作用。

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  • 来源
    《Physical review》 |2011年第18期|p.184423.1-184423.8|共8页
  • 作者

    Haruhiko Kuroe; Tomoaki Hamasaki; Tomoyuki Sekine; Masashi Hase; Kunihiko Oka; Toshimitsu Ito; Hiroshi Eisaki; Koji Kaneko; Naoto Metoki; Masaaki Matsuda; Kazuhisa Kakurai;

  • 作者单位

    Department of Physics, Sophia University, 7-1 Kioi-cho, Chiyoda-ku, Tokyo 102-8554, Japan;

    Department of Physics, Sophia University, 7-1 Kioi-cho, Chiyoda-ku, Tokyo 102-8554, Japan;

    Department of Physics, Sophia University, 7-1 Kioi-cho, Chiyoda-ku, Tokyo 102-8554, Japan;

    National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0047, Japan;

    National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan;

    National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan;

    National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan;

    Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan;

    Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan;

    Quantum Beam Science Directorate, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan;

    Quantum Beam Science Directorate, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan;

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  • 关键词

    neutron inelastic scattering; quantized spin models;

    机译：中子非弹性散射;量化自旋模型;

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