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Spin correlations and Dzyaloshinskii-Moriya interaction in Cs_2CuCl_4

机译:Cs_2CuCl_4中的自旋相关性和Dzyaloshinskii-Moriya相互作用

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摘要

We report on electron spin resonance (ESR) studies of the spin relaxation in Cs_2CuCl_4. The main source of the ESR linewidth at temperatures T is contained in 150 K is attributed to the uniform Dzyaloshinskii-Moriya interaction. The vector components of the Dzyaloshinskii-Moriya interaction are determined from the angular dependence of the ESR spectra using a high-temperature approximation. Both the angular and temperature dependencies of the ESR linewidth have been analyzed using a self-consistent quantum-mechanical approach. In addition, analytical expressions based on a quasiclassical picture for spin fluctuations are derived, which show good agreement with the quantum-approach for temperatures T contains 2J/k_B ≈ 15 K. A small modulation of the ESR linewidth observed in the ac plane is attributed to the anisotropic Zeeman interaction, which reflects the two magnetically nonequivalent Cu positions.
机译:我们报告了Cs_2CuCl_4中自旋弛豫的电子自旋共振(ESR)研究。温度T下ESR线宽的主要来源包含在150 K中,这归因于均匀的Dzyaloshinskii-Moriya相互作用。 Dzyaloshinskii-Moriya相互作用的矢量分量是使用高温近似从ESR光谱的角度依赖性确定的。使用自洽量子力学方法分析了ESR线宽的角度和温度依赖性。另外,导出了基于准经典图片的自旋涨落的解析表达式,该表达式与温度T包含2J / k_B≈15 K时的量子方法显示出良好的一致性。归因于对交流平面内ESR线宽的小调制各向异性塞曼相互作用,反映了两个磁性上不等价的铜位置。

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  • 来源
    《Physical review》 |2013年第17期|174421.1-174421.7|共7页
  • 作者单位

    Institute for Physics, Kazan (Volga region) Federal University, 420008, Kazan, Russia;

    Institute for Physics, Kazan (Volga region) Federal University, 420008, Kazan, Russia,E. K. Zavoisky Physical-Technical Institute RAS, 420029 Kazan, Russia;

    Institute for Physics, Kazan (Volga region) Federal University, 420008, Kazan, Russia;

    Experimentalphysik V, Center for Electronic Correlations and Magnetism, Institute for Physics, Augsburg University, D-86135 Augsburg, Germany;

    Physikalisches Institut, Goethe-Universitaet Frankfurt, Max-von-Laue-Strasse 1, 60438 Frankfurt am Main, Germany;

    Physikalisches Institut, Goethe-Universitaet Frankfurt, Max-von-Laue-Strasse 1, 60438 Frankfurt am Main, Germany;

    Physikalisches Institut, Goethe-Universitaet Frankfurt, Max-von-Laue-Strasse 1, 60438 Frankfurt am Main, Germany;

    Experimentalphysik V, Center for Electronic Correlations and Magnetism, Institute for Physics, Augsburg University, D-86135 Augsburg, Germany;

    Experimentalphysik V, Center for Electronic Correlations and Magnetism, Institute for Physics, Augsburg University, D-86135 Augsburg, Germany;

    Experimentalphysik V, Center for Electronic Correlations and Magnetism, Institute for Physics, Augsburg University, D-86135 Augsburg, Germany;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    electron paramagnetic resonance and relaxation;

    机译:电子顺磁共振和弛豫;

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