| Autor: |
S. Scherle, Peter Fischer, M. Knülle, G. Wiesinger, S. Stähler, G. Schütz |
| Rok vydání: |
1992 |
| Předmět: |
|
| Zdroj: |
Solid State Communications. 82:857-861 |
| ISSN: |
0038-1098 |
| DOI: |
10.1016/0038-1098(92)90708-h |
| Popis: |
The spin dependence of the absorption of X-rays at the L 2 - and L 3 - edges of Ho Ho 3 Fe 5 O 12 , Ho 6 Fe 23 and Ho 2 Co 17 in Ho-metal, has been studied experimentally using circularly polarized synchrotron radiation. We have observed for the first time magnetic effects at the L 2 -edges showing a significant dependence on the chemical environment, while the magnetic L 3 -absorption exhibits a strong pre-edge minimum independent of the sorrounding electronic or magnetic structure. Its amplitude is directly correlated with the orientation of the atomic local moment with respect to the photon beam direction. At the Ho L 3 -edges we have proven the multipole character of the involved transition by studying the dichroic effects with the sample's magnetization aligned both in and at an angle of 60° with respect to the photon beam direction. The data clearly confirm, that the spin dependence of the absorption spectra results from dipole transitions. The results are compared with theoretical predictions and their content of information on magnetic aspects of the electronic structure is discussed. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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