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首页> 外文期刊>Physical review >Unconventional magnetic order in the frustrated diamond-lattice antiferromagnet CoAl_2O_4 studied by neutron diffraction and classical Monte Carlo simulation
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Unconventional magnetic order in the frustrated diamond-lattice antiferromagnet CoAl_2O_4 studied by neutron diffraction and classical Monte Carlo simulation

机译:中子衍射和经典蒙特卡洛模拟研究失意金刚石-晶格反铁磁体CoAl_2O_4中的非常规磁序

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摘要

CoAl_2O_4 spinel with magnetic Co~(2+) ions on the diamond lattice is known to be magnetically frustrated. We compare neutron single-crystal diffraction patterns measured in zero and applied magnetic fields with the ones obtained from classical Monte Carlo models. In simulations we test the influence of various parameters on diffraction patterns: the ratio of nearest-, J_1,and next-nearest-, J_2, neighbor interactions, magnetic field applied along the principal crystallographic directions, and random disorder on the A(Co~(2+)) and S(A1~(3+)) sites. We conclude that the models considered so far explain the broadening of magnetic Bragg peaks in zero magnetic field and their anisotropic response to applied magnetic field only partly. As bulk properties of our single crystal are isotropic, we suggest that its microstructure, specifically 〈111〉-twin boundaries, could be a reason for the nonconventional magnetic order in CoAl_2O_4.
机译:已知在金刚石晶格上具有磁性Co〜(2+)离子的CoAl_2O_4尖晶石会被磁化。我们将在零磁场和外加磁场中测得的中子单晶衍射图与从经典蒙特卡洛模型获得的中子单晶衍射图进行比较。在模拟中,我们测试了各种参数对衍射图的影响:最近的J_1和下一个最近的J_2之比,邻域相互作用,沿主要晶体学方向施加的磁场以及A(Co〜 (2+))和S(A1〜(3+))网站。我们得出的结论是,迄今考虑的模型仅部分解释了零磁场中磁布拉格峰的变宽及其各向异性对施加磁场的响应。由于我们单晶的整体性质是各向同性的,我们认为它的微观结构,特别是& 111&-孪晶边界,可能是CoAl_2O_4中非常规磁序的原因。

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  • 来源
    《Physical review》 |2014年第13期|134416.1-134416.7|共7页
  • 作者单位

    Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute, CH-5232 Villigen, Switzerland;

    Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute, CH-5232 Villigen, Switzerland;

    Laboratory for Micro- und Nanotechnology, Paul Scherrer Institute, CH-5232 Villigen, Switzerland;

    Laboratory for Synchrotron Radiation-Condensed Matter, Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen, Switzerland;

    Leibniz Institute for Solid State and Materials Research Dresden, Helmholtzstrasse 20, 01069 Dresden, Germany;

    Leibniz Institute for Solid State and Materials Research Dresden, Helmholtzstrasse 20, 01069 Dresden, Germany;

    Leibniz Institute for Solid State and Materials Research Dresden, Helmholtzstrasse 20, 01069 Dresden, Germany;

    Experimental Physics V, Center for Electronics Correlations and Magnetism, University of Augsburg, D-86159 Augsburg, Germany and Institute of Applied Physics, Academy of Sciences of Moldova, MD-2028 Chisinau, Republic of Moldova;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    magnetic liquids;

    机译:磁性液体;

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