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首页> 外文期刊>Physical review >Neutron scattering evidence for isolated spin-1/2 ladders in (C_5D_(12)N)_2CuBr_4
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Neutron scattering evidence for isolated spin-1/2 ladders in (C_5D_(12)N)_2CuBr_4

机译:(C_5D_(12)N)_2CuBr_4中孤立的自旋1/2梯子的中子散射证据

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摘要

Inelastic neutron scattering was used to determine the spin Hamiltonian for the singlet ground-state system of fully deuterated BPCB, (C_5D_(12)N)_2CuBr_4. A two-leg spin-1/2 ladder model, with J_⊥ = (1.09±0.01) meV and J_‖ = (0.296 ± 0.005) meV, accurately describes the data. The experimental limit on the effective interladder exchange constant is |J_(int)~(eff)|≤ 0.006 meV, and the limit on total diagonal, intraladder exchange is |J_F+J_F'| ≤ 0.1 meV. Including the effects of copper to bromide covalent spin transfer on the magnetic form factor, the experimental ratios of intraladder bond energies are consistent with the predictions of continuous unitary transformation.
机译:使用非弹性中子散射来确定完全氘化的BPCB(C_5D_(12)N)_2CuBr_4的单重态基态系统的自旋哈密顿量。 J_⊥=(1.09±0.01)meV和J__ =(0.296±0.005)meV的两腿自旋1/2阶梯模型可以准确地描述数据。有效阶梯间交换常数的实验极限为| J_(int)〜(eff)|≤0.006 meV,总对角线,阶梯间交换的极限为| J_F + J_F'|。 ≤0.1 meV。包括铜到溴化物的共价自旋转移对磁性形状因数的影响,阶梯内键能的实验比率与连续unit变的预测一致。

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  • 来源
    《Physical review》 |2009年第9期|094411.1-094411.8|共8页
  • 作者单位

    Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA;

    Neutron Scattering Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6477, USA;

    Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA NCNR, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6100, USA;

    Department of Physics and NHMFL, University of Florida, Gainesville, Florida 32611-8440, USA;

    NCNR, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6100, USA;

    Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, USA;

    Department of Physics and NHMFL, University of Florida, Gainesville, Florida 32611-8440, USA;

    Lehrstuhl fuer theoretische Physik I, Otto-Hahn-Str. 4, D-44221 Dortmund, Germany;

    Lehrstuhl fuer theoretische Physik I, Otto-Hahn-Str. 4, D-44221 Dortmund, Germany;

    Neutron Scattering Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6477, USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    quantized spin models; dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.); antiferromagnetics; neutron inelastic scattering;

    机译:量化自旋模型动态特性(动态磁化率;自旋波;自旋扩散;动态缩放等);反铁磁中子非弹性散射;

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