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首页> 外文期刊>Physical review >Element and orbital-specific observation of two-step magnetic transition in NpNiGa_5: X-ray magnetic circular dichroism study
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Element and orbital-specific observation of two-step magnetic transition in NpNiGa_5: X-ray magnetic circular dichroism study

机译:NpNiGa_5中两步磁跃迁的元素和轨道特定观察:X射线磁性圆二色性研究

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摘要

X-ray magnetic circular dichroism (XMCD) experiments were performed at the Np M_(4,5) and the Ga K absorption edges of NpNiGa_5 to investigate the temperature-dependent changes of magnetic properties of Np 5f and Ga 4p electron states. By the sum-rule analysis of the Np M_(4,5) XMCD data, the orbital magnetic moment μ_L and the spin magnetic moment μ_s were estimated for the Np 5f~3 and 5f~4 electronic configurations and their comparison to the previous magnetization and neutron-scattering experiments suggests that the 5f~4 configuration is more likely than the 5f~3 configuration in NpNiGa_5. It was found that |μ_L/μ_S| tends to increase from the high-temperature low-moment ordered state to the low-temperature high-moment ordered state. The result of the Ga K XMCD indicates that the Ga 4p electrons are magnetically polarized and the temperature and magnetic-field dependences of the Ga 4p orbital moment are proportional to those of the magnetization measurements.
机译:在Np M_(4,5)和NpNiGa_5的Ga K吸收边缘上进行了X射线磁性圆二色性(XMCD)实验,以研究Np 5f和Ga 4p电子态的磁性能随温度的变化。通过对Np M_(4,5)XMCD数据的求和分析,可以估算Np 5f〜3和5f〜4电子结构的轨道磁矩μ_L和自旋磁矩μ_s并将其与先前的磁化强度进行比较中子散射实验表明,在NpNiGa_5中5f〜4构型比5f〜3构型更有可能。发现|μ_L/μ_S|从高温低矩有序状态向低温高矩有序状态增加的趋势。 Ga K XMCD的结果表明,Ga 4p电子被磁化,并且Ga 4p轨道矩的温度和磁场依赖性与磁化强度成正比。

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  • 来源
    《Physical review》 |2009年第10期|104419.1-104419.7|共7页
  • 作者单位

    Synchrotron Radiation Research Center, Japan Atomic Energy Agency, Hyogo 679-5148, Japan;

    Synchrotron Radiation Research Center, Japan Atomic Energy Agency, Hyogo 679-5148, Japan SPring-8/Japan Synchrotron Radiation Research Institute, Hyogo 679-5198, Japan;

    Synchrotron Radiation Research Center, Japan Atomic Energy Agency, Hyogo 679-5148, Japan;

    Synchrotron Radiation Research Center, Japan Atomic Energy Agency, Hyogo 679-5148, Japan;

    Synchrotron Radiation Research Center, Japan Atomic Energy Agency, Hyogo 679-5148, Japan;

    SPring-8/Japan Synchrotron Radiation Research Institute, Hyogo 679-5198, Japan;

    SPring-8/Japan Synchrotron Radiation Research Institute, Hyogo 679-5198, Japan;

    SPring-8/Japan Synchrotron Radiation Research Institute, Hyogo 679-5198, Japan;

    Synchrotron Radiation Research Center, Japan Atomic Energy Agency, Hyogo 679-5148, Japan Department of Physics, Kyoto Sangyo University, Kyoto 603-8555, Japan;

    Synchrotron Radiation Research Center, Japan Atomic Energy Agency, Hyogo 679-5148, Japan Department of Physics, University of Tokyo, Tokyo 113-0033, Japan;

    Department of Quantum Matters, ADSM, Hiroshima University, Hiroshima 739-8530, Japan;

    Institute for Materials Research, Tohoku University, Ibaraki 311-1313, Japan INAC/SPSMS, CEA-Grenoble, 17 rue des Martyrs, 38054 Grenoble, France;

    Institute for Materials Research, Tohoku University, Ibaraki 311-1313, Japan;

    Institute for Materials Research, Tohoku University, Ibaraki 311-1313, Japan;

    Advanced Science Research Center, Japan Atomic Energy Agency, Ibaraki 319-1195, Japan;

    Advanced Science Research Center, Japan Atomic Energy Agency, Ibaraki 319-1195, Japan;

    Advanced Science Research Center, Japan Atomic Energy Agency, Ibaraki 319-1195, Japan;

    Advanced Science Research Center, Japan Atomic Energy Agency, Ibaraki 319-1195, Japan Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    strongly correlated electron systems; heavy fermions; local moment in compounds and alloys; kondo effect, valence fluctuations, heavy fermions; magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.); X-ray absorption spectra;

    机译:强相关电子系统;重费米子化合物和合金中的局部力矩;近藤效应;化合价涨落;费米重子;磁相边界(包括磁跃迁;超磁性等);X射线吸收光谱;

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