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首页> 外文期刊>Physical review >Valence, exchange interaction, and location of Mn ions in polycrystalline Mn_xGa_（1-x)N (x ≤0.04)
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Valence, exchange interaction, and location of Mn ions in polycrystalline Mn_xGa_（1-x)N (x ≤0.04)

机译：多晶Mn_xGa_（1-x）N（x≤0.04）中Mn离子的价，交换相互作用和位置

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摘要

We present an experimental study for polycrystalline samples of the diluted magnetic semiconductor Mn_xGa_(1-x)N (x ≤ 0.04) in order to address some of the existing controversial issues, X-ray and neutron diffraction, x-ray absorption near-edge structure, and electron paramagnetic resonance experiments were used to characterize the structural, electronic, and magnetic properties of the samples, and inelastic neutron scattering was employed to determine the magnetic excitations associated with Mn monomers and dimers. Our main conclusions are as follows: (i) The valence of the Mn ions is 2+. (ii) The Mn~(2+) ions experience a substantial single-ion axial anisotropy with parameter D = 0.027(3) meV. (iii) Nearest-neighbor Mn~(2+) ions are coupled antiferromagnetically. The exchange parameter J =-0.140(7) meV is independent of the Mn content x; i.e., there is no evidence for hole-induced modifications of J towards a potentially high Curie temperature postulated in the literature.
机译：我们针对稀磁半导体Mn_xGa_（1-x）N（x≤0.04）的多晶样品进行实验研究，以解决一些现有的有争议的问题，即X射线和中子衍射，近边缘的X射线吸收用结构，电子顺磁共振实验来表征样品的结构，电子和磁性，并使用非弹性中子散射来确定与Mn单体和二聚体有关的磁激发。我们的主要结论如下：（i）锰离子的化合价为2+。 （ii）Mn〜（2+）离子具有很大的单离子轴向各向异性，参数D = 0.027（3）meV。 （iii）最近的Mn〜（2+）离子反铁磁耦合。交换参数J = -0.140（7）meV与Mn含量x无关；即，在文献中没有证据表明空穴诱导的J朝着居里温度可能升高的方向进行了修饰。

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  • 来源
    《Physical review》 |2018年第14期|6-11|共6页
  • 作者

    A. Furrer; K. W. Kramer; A. Podlesnyak; V. Pomjakushin; D. Sheptyakov; O. V. Safonova;

  • 作者单位

    Laboratory for Neutron Scattering, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland;

    Department of Chemistry and Biochemistry, University of Bern, CH-3012 Bern, Switzerland;

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

    Laboratory for Neutron Scattering, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland;

    Laboratory for Neutron Scattering, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland;

    Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland;

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  • 正文语种 eng
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  • 关键词

    140102.1-140102.6;

    机译：140102.1-140102.6;

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