Photoemission electronic states and magnetic properties of Dy(Co_1−xFe_x)₂

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• 作者：R. Zalecki ; P. Stoch ; P. Guzdek ; A. Koł ; odziejczyk ; J. Pszczoł ; a
• 关键词：Intermetallic compounds ; Photoemission ; Band structure ; FLAPW method
• 刊名：Journal of Alloys and Compounds
• 出版年：2007
• 出版时间：13 September 2007
• 年：2007
• 卷：442
• 期：1-2
• 页码：292-295
• 全文大小：338 K

文摘

The valence band electronic states of Dy(Co_1−xFe_x)₂ Laves phases with x = 0, 0.05, 0.1, 0.7 and 1.0 were measured by the ultraviolet photoemission spectroscopy (UPS) in room temperature. The Curie temperatures were determined from the electrical resistivity measurements and from the temperature dependence of the hyperfine fields by ⁵⁷Fe Mössbauer spectroscopy. The UPS spectra showed the very pronounced composition dependent emission at the Fermi energy E_F, the broad band within 0 and −4 eV binding energy interval below E_F and two strong features at about −6.5 and −9.0 eV. The spectra were compared with the band structure calculations using the full-potential linearized augmented plane waves (FLAPW) method. From the comparison we concluded that the intensities at E_F are correlated with the values of the Curie temperatures, the broad band comes entirely from different 3d Co and/or Fe states and the strong two features come entirely from 4f electrons of dysprosium.