Spin Fluctuation Spectrum of One-Dimensional Spin 1/2 Heisenberg Antiferromagnet in an Applied Magnetic Field
Spin Fluctuation Spectrum of One-Dimensional Spin 1/2 Heisenberg Antiferromagnet in an Applied Magnetic Field
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一维自旋1/2海森堡反铁磁体在外加磁场中的自旋涨落谱
DOI：
10.1143/ptp.64.479
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发表时间：
1980
影响因子：
--
通讯作者：
H. Shiba
中科院分区：
文献类型：
--
作者：
N. Ishimura;H. Shiba
研究了一维自旋1/2各向同性海森堡反铁磁体的横向和纵向自旋涨落谱的磁场效应。我们对有限自旋链的动力学关联函数进行了精确的计算。结果表明，很大一部分强度集中在des Cloizeaux-Pearson谱上，这是作者以前在有限磁场情况下研究的（Prog. Theor. Phys.57（1977），1862）。这一观察相结合的动力学相关函数的一般考虑。我们比较目前的理论与海尔曼等人。的CuCl_2·2NC_5D_5中子实验。还研究了静态相关函数的磁场依赖性。特别是纵向静态相关函数表现出有趣的波矢依赖性，这是值得研究的实验。
The magnetic-field effect on the transverse and longitudinal spin fluctuation spectra is studied for one-dimensional spin 1/2 isotropic Heisenberg antiferromagnet. We perform an exact calculation of dynamical correlation functions for finite-spin chains. The result shows that a large portion of the intensity is concentrated on the des Cloizeaux-Pearson spectrum, which was studied previously for finite-magnetic-field case by the authors (Prog. Theor. Phys.57(1977), 1862). This observation is combined with general considerations on dynamical correlation functions. We compare the present theory with Heilmann et al.'s neutron experiment on CuCl2·2NC5D5. A study is made also on the magnetic-field dependence of the static correlation functions. The longitudinal static correlation function in particular shows interesting wave-vector dependence, which is worth investigating experimentally.