DPG Phi
Verhandlungen
Verhandlungen
DPG

Berlin 2012 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

MA: Fachverband Magnetismus

MA 35: Magnetic Heusler Compounds I

MA 35.9: Vortrag

Mittwoch, 28. März 2012, 17:30–17:45, H 0112

Symmetry of valence states of Heusler compounds explored by linear dichroism in hard X-ray photoelectron spectroscopy — •S. Ouardi1, G. H. Fecher1,2, C. Shekhar2, B. Balke1, A. Gloskovskii1, C. Felser1,2, E. Ikenaga3, S. Ueda4, and K. Kobayashi41Institute of Inorganic Chemistry and Analytical Chemistry, Johannes Gutenberg - University, Mainz — 2Max Planck Institute for Chemical Physics of Solids, Dresden, Germany. — 3Japan Synchrotron Radiation Research Institute, SPring-8, Hyogo, Japan — 4National Institute for Materials Science, SPring-8, Hyogo, Japan

In the present work, a combination of the the linear dichroism in the angular distribution (LDAD) with the bulk-sensitive hard-x-ray photoelectron spectroscopy (HAXPES) technique was used to investigate the symmetry of the valence states of magnetic, semiconducting and gapless Heusler compounds with C1b structure. High-resolution photoelectron spectroscopy was performed with an excitation energy of hν=7.938 keV. The linear polarization of the photons was changed using an in-vacuum diamond phase retarder. The valence band spectra exhibit the typical structure expected from first-principles calculations of the electronic structure of these compounds. Noticeable linear dichroism is found in the valence band of the materials and this allows for a symmetry analysis of the contributing states. The differences in the spectra are found to be caused by symmetry-dependent angular asymmetry parameters, and these occur even in polycrystalline samples without preferential crystallographic orientation.

100% | Mobil-Ansicht | English Version | Kontakt/Impressum/Datenschutz
DPG-Physik > DPG-Verhandlungen > 2012 > Berlin