Electronic and crystallographic structure, hard x-ray photoemission, and mechanical and transport properties of the half-metallic Heusler compound Co2MnGe
Electronic and crystallographic structure, hard x-ray photoemission, and mechanical and transport properties of the half-metallic Heusler compound Co2MnGe
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DOI：
10.1103/physrevb.84.155122
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发表时间：
2011-10
影响因子：
3.7
通讯作者：
S. Ouardi;G. Fecher;B. Balke;Andreea Beleanu;X. Kozina;G. Stryganyuk;C. Felser;Werner Klöß;H. Schrader;F. Bernardi;J. Morais;E. Ikenaga;Y. Yamashita;S. Ueda;Keisuke L. I. Kobayashi
中科院分区：
文献类型：
--
作者：
S. Ouardi;G. Fecher;B. Balke;Andreea Beleanu;X. Kozina;G. Stryganyuk;C. Felser;Werner Klöß;H. Schrader;F. Bernardi;J. Morais;E. Ikenaga;Y. Yamashita;S. Ueda;Keisuke L. I. Kobayashi
本文报道了多晶Heusler化合物Co2MnGe的电子和晶体结构以及机械、磁性和输运性质。利用扩展x射线吸收精细结构光谱和异常x射线衍射对晶体结构进行了详细的研究。该化合物具有良好的L21结构，这是典型的Heusler化合物2:1:1的化学计量。低温磁矩符合Slater-Pauling规则，表明化合物为半金属铁磁态，这与从头计算的结果一致。通过输运测量和硬x射线光电子能谱分析来解释化合物的电子结构。得到的价带光谱表现出小的能量位移，这是光激发过程的结果，而基态中的电子-电子相关可以忽略不计。计算了复合材料的振动性能和力学性能。观察到的硬度值与Co2MnGe的共价键相一致。
This work reports on the electronic and crystalline structure and the mechanical, magnetic, and transport properties of the polycrystalline Heusler compound Co2MnGe. The crystalline structure was examined in detail by extended x-ray absorption fine-structure spectroscopy and anomalous x-ray diffraction. The compound exhibits a well-ordered L21 structure as is typical for Heusler compounds with 2:1:1 stoichiometry. The low-temperature magnetic moment agrees well with the Slater-Pauling rule and indicates a half-metallic ferromagnetic state of the compound, as is predicted by ab initio calculations. Transport measurements and hard x-ray photoelectron spectroscopy were performed to explain the electronic structure of the compound. The obtained valence band spectra exhibit small energy shifts that are the result of the photoexcitation process, whereas electron-electron correlation in the ground state is negligible. The vibration and mechanical properties of the compound were calculated. The observed hardness values are consistent to a covalent-like bonding of Co2MnGe.