Magnetic, electronic and transport properties of RAg2Ge2 (R=Pr, Nd) compounds
| Autor: | J. Hernandez-Velasco, Stanisław Baran, N. Stüßer, Ł. Gondek, E. Wawrzyńska, A. Szytuła, Maria Bałanda, B. Penc, Dariusz Kaczorowski |
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| Rok vydání: | 2006 |
| Předmět: |
Materials science
Valence (chemistry) Photoemission spectroscopy Mechanical Engineering Neutron diffraction Metals and Alloys General Chemistry Magnetic susceptibility Magnetization Tetragonal crystal system Crystallography Mechanics of Materials Electrical resistivity and conductivity Materials Chemistry Antiferromagnetism |
| Zdroj: | Intermetallics. 14:315-324 |
| ISSN: | 0966-9795 |
| DOI: | 10.1016/j.intermet.2005.06.006 |
| Popis: | Magnetization, magnetic susceptibility, electrical resistivity, thermoelectric power, neutron diffraction and X-Ray photoemission spectroscopy measurements were performed on polycrystalline samples of PrAg 2 Ge 2 and NdAg 2 Ge 2 , both crystallizing with a tetragonal structure of the ThCr 2 Si 2 -type. The data indicate that both compounds order magnetically at low temperatures, PrAg 2 Ge 2 at 12 K and NdAg 2 Ge 2 at 2 K. Neutron diffraction data for the latter indicate antiferromagnetic collinear structure described by the propagation vector k =(½, 0, ½) at 1.5 K. Both compounds exhibit metallic-like electrical behavior. The X-Ray photoemission data indicate that the valence bands are formed mainly by the Ag 4d bands. The spin-orbit splitting values determined from the XPS spectra of Pr and Nd, 3d 5/2 and 3d 3/2 , equal 20.5 eV for the Pr compound and 22.7 eV for the Nd compound. The analysis of these spectra performed on the basis of the Gunnarsson-Schonhammer model indicates a weak hybridization of the 4f electrons with the conduction band. |
| Databáze: | OpenAIRE |
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