Localized magnetic moments in the Heusler alloy Rh2MnGe
| Autor: | H. J. Elmers, Lubna Basit, M. Kallmayer, Stanislav Chadov, P. Klaer, Claudia Felser, J. Thöne |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
X-ray absorption spectroscopy
Acoustics and Ultrasonics Condensed matter physics Absorption spectroscopy Magnetic moment Magnetic circular dichroism Heisenberg model Chemistry Condensed Matter Physics Surfaces Coatings and Films Electronic Optical and Magnetic Materials Condensed Matter::Materials Science Magnetization Ferromagnetism Condensed Matter::Strongly Correlated Electrons Local-density approximation |
| Zdroj: | Journal of Physics D: Applied Physics. 42:084001 |
| ISSN: | 1361-6463 0022-3727 |
| Popis: | X-ray magnetic circular dichroism (XMCD) of core-level absorption (x-ray absorption spectroscopy, XAS) spectra in the soft x-ray region has been measured for the ferromagnetic Heusler alloy Rh2MnGe at the Rh M3,2 and Mn L3,2 edges. The ratio of Rh and Mn spin moments amounts to 0.05 which is smaller than the ratio of 0.1 determined by a local density approximation electronic band structure calculation. We have found that the orbital moments of the Rh 4d and Mn 3d states are very small. The observed Rh 2p XAS spectrum can be understood on the basis of the Rh 3d partial density of unoccupied states as is typical for metals. The observed features of the Mn 2p XAS and XMCD spectra are dominated by final state multiplets as is typical for oxides. The comparison of experimental and ab initio calculated XAS/XMCD spectra reveals a strong narrowing of the Mn 3d bands, indicating strongly localized Mn moments. The magnetic moments are considerably more localized for Rh2MnGe in comparison with the isoelectronic compound Co2MnGe. In spite of the strong localization of the Mn moment, the temperature dependences of sublattice magnetization are equal for the Mn and Rh sublattices in contrast to the prediction by a Heisenberg model. This might be attributed to the remaining itinerant character of the Rh moment. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|