Finite temperature magnetism in Gd: evidence against a Stoner behavior.
Finite temperature magnetism in Gd: evidence against a Stoner behavior.
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Gd 中的有限温度磁性：反对斯通纳行为的证据。
DOI：
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发表时间：
2002
影响因子：
8.6
通讯作者：
C. Carbone
中科院分区：
文献类型：
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作者：
K. Maiti;M. Malagoli;A. Dallmeyer;C. Carbone
稀土价带的温度依赖性被认为是斯托纳行为的实现。当 T<T(C) 时，电子态的交换分裂似乎随着磁序参数的变化而变化，并在 T = T(C) 时消失。我们在这里报告了一项关于 0.5< 或 =T/T(C)< 或 =1 的 Gd 体能带演化的自旋分辨光电子研究。自旋偏振谱线形状显示出复杂的温度依赖性，这与之前实验结果的解释形成鲜明对比。自旋分辨光发射数据证明了斯托纳模型不足以描述稀土的磁性。
The temperature dependence of the rare-earth valence bands has been regarded as a realization of the Stoner behavior. The exchange splitting of the electronic states appears to scale as the magnetic order parameter for T<T(C) and to vanish at T = T(C). We report here a spin-resolved photoemission study on the evolution of Gd bulk bands for 0.5< or =T/T(C)< or=1. The spin-polarized spectral line shapes display a complex temperature dependence, which clearly contrasts with the interpretation of previous experimental results. The spin-resolved photoemission data demonstrate the inadequacy of the Stoner model to the description of magnetism in rare earths.