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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Magnetic and electronic properties of RCo_xGe_2 (R = Pr, Nd) compounds
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Magnetic and electronic properties of RCo_xGe_2 (R = Pr, Nd) compounds

机译：RCo_xGe_2（R = Pr，Nd）化合物的磁性和电子性质

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摘要

Magnetization, magnetic susceptibility, neutron diffraction and X-ray photoemission spectroscopy measurements were performed on polycrys-talline samples: PrCo_(0.85)Ge_2 and NdCo_(0.82)Ge_2, crystallizing in an orthorhombic structure of the CeNiSi_2-type. The magnetometric data indicate that both compounds are antiferromagnetic at low temperatures, PrCo_(0.85)Ge_2 below 5 KAPPA and NdCo_(0.82)Ge_2 below 2.1 KAPPA. The neutron diffraction data indicate an antiferromagnetic structure in PrCo_(0.85)Ge_2 at 1.5 KAPPA and give no evidence of any magnetic ordering in NdCo_(0.82)Ge_2. The X-ray photoemission data indicate that the valence bands are formed predominantly by R 4f5d6s and Co 3d bands. The spin-orbit splitting values determined from the Pr and Nd, 3d_(5/2) and 3d_(3/2) XPS spectra are equal to 20.9 eV for the Pr compound and 23.0 eV for the Nd compound. The analysis of these spectra performed on the basis of the Gunnarsson-Schonhammer model revealed a small hybridization between 4f-electrons of the rare earths with the conduction band which implies rather good stability of the f shell in these compounds.
机译：磁化，磁化率，中子衍射和X射线光电子能谱测量是在多晶talline样品PrCo_（0.85）Ge_2和NdCo_（0.82）Ge_2上进行的，以CeNiSi_2型正交晶结构结晶。磁力数据表明，两种化合物在低温下都是反铁磁性的，低于5 KAPPA的PrCo_（0.85）Ge_2和低于2.1 KAPPA的NdCo_（0.82）Ge_2。中子衍射数据表明在1.5 KAPPA时PrCo_（0.85）Ge_2中的反铁磁结构，而没有给出NdCo_（0.82）Ge_2中任何磁序的证据。 X射线光发射数据表明价带主要由R 4f5d6s和Co 3d带形成。由Pr和Nd，3d_（5/2）和3d_（3/2）XPS光谱确定的自旋轨道分裂值等于Pr化合物为20.9 eV，Nd化合物为23.0 eV。在Gunnarsson-Schonhammer模型的基础上对这些光谱进行的分析显示，稀土的4f电子与导带之间杂乱无章，这说明这些化合物中f壳的稳定性相当好。

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