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Defect-induced magnetism in graphite through neutron irradiation

机译:通过中子辐照石墨中的缺陷感应磁

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摘要

We have investigated the variation in the magnetization of highly ordered pyrolytic graphite (HOPG) after neutron irradiation, which introduces defects in the bulk sample and consequently gives rise to a large magnetic signal. We observe strong paramagnetism in HOPG, increasing with the neutron fluence. The induced paramagnetism can be well correlated with structural defects by comparison with density-functional theory calculations. In addition to the in-plane vacancies, the transplanar defects also contribute to the magnetization. The lack of any magnetic order between the local moments is possibly due to the absence of hydrogenitrogen chemisorption, or the magnetic order cannot be established at all in the bulk form.
机译:我们已经研究了中子辐照后高度有序的热解石墨(HOPG)的磁化强度变化,这种变化会在整体样品中引入缺陷,因此会产生较大的磁信号。我们观察到HOPG中具有较强的顺磁性,并随着中子注量的增加而增加。通过与密度泛函理论计算相比较,可以将感应的顺磁性与结构缺陷很好地关联起来。除了面内空位,跨面缺陷也有助于磁化。局部力矩之间没有任何磁序可能是由于氢/氮化学吸附的缺乏,或者根本无法建立整体形式的磁序。

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  • 来源
    《Physical review》 |2014年第21期|214435.1-214435.9|共9页
  • 作者单位

    Helmholtz-Zentrum Dresden-Rossendorf, Institute of Ion Beam Physics and Materials Research, P.O. Box 510119, 01314 Dresden, Germany,Technische Universitaet Dresden, 01062 Dresden, Germany;

    Univ. Grenoble Alpes, INAC-SP2M, L_Sim, F-38000 Grenoble, France,CEA, INAC-SP2M, Atomistic Simulation Lab., F-38000 Grenoble, France;

    Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA;

    Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA;

    Helmholtz-Zentrum Berlin fuer Materialien und Energie, Lise-Meitner-Campus, Hahn-Meitner-Platz 1, 14109 Berlin, Germany;

    Helmholtz-Zentrum Dresden-Rossendorf, Institute of Ion Beam Physics and Materials Research, P.O. Box 510119, 01314 Dresden, Germany,Faculty of Science, Technische Universitaet Chemnitz, 09107 Chemnitz, Germany,Center for Advancing Electronics Dresden, Technische Universitaet Dresden, 01314 Dresden, Germany;

    Helmholtz-Zentrum Dresden-Rossendorf, Institute of Ion Beam Physics and Materials Research, P.O. Box 510119, 01314 Dresden, Germany,Technische Universitaet Dresden, 01062 Dresden, Germany,Center for Advancing Electronics Dresden, Technische Universitaet Dresden, 01314 Dresden, Germany;

    Helmholtz-Zentrum Dresden-Rossendorf, Institute of Ion Beam Physics and Materials Research, P.O. Box 510119, 01314 Dresden, Germany;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    magnetic semiconductors; density functional theory, local density approximation, gradient and other corrections;

    机译:磁性半导体密度泛函理论;局部密度近似;梯度和其他校正;

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