Test of band structure calculations for Heusler compounds by spin-resolved photoemission spectroscopy
Test of band structure calculations for Heusler compounds by spin-resolved photoemission spectroscopy
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DOI：
10.1103/physrevb.86.024422
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发表时间：
2012-07-17
影响因子：
3.7
通讯作者：
Jourdan, M.
中科院分区：
文献类型：
--
作者：
Kolbe, M.;Chadov, S.;Jourdan, M.
用自旋分辨紫外光电子能谱原位探测了Heusler化合物Co_2MnGa外延薄膜的电子态密度。实验揭示了强度谱中的几个特征和清晰的费米边缘签名。在费米边缘处类似或等于55%的高自旋极化之后是在类似或等于0.8eV的结合能处的符号变化。采用自旋极化相对论Korringa-Kohn-Rostoker代码对能带结构和光发射谱进行了相应的计算。计算结果与实验数据吻合较好，包括动力学关联效应。
The electronic density of states of epitaxial thin films of the Heusler compound Co2MnGa is probed in situ by spin-resolved ultraviolet photoemission spectroscopy. The experiments reveal several characteristic features in the intensity spectrum and a clear Fermi edge signature. A high spin polarization of similar or equal to 55% at the Fermi edge is followed by a sign change at the binding energy of similar or equal to 0.8 eV. Corresponding calculations of the band structure and the photoemission spectrum were performed employing a spin-polarized relativistic Korringa-Kohn-Rostoker code. Good agreement between the experimental data and calculations was obtained, including dynamical correlation effects.