title: Symmetry of valence states of Heusler compounds explored by linear dichroism in hard-x-ray photoelectron spectroscopy.
abstract: This study reports on the linear dichroism in angular-resolved photoemission from the valence band of the Heusler compounds NiTi0.9Sc0.1Sn and NiMnSb. 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 both 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.
authors.affiliation: Institut für Anorganische und Analytische Chemie, Johannes Gutenberg-Universität, 55099 Mainz, Germany.
authors.forename: Siham
authors.initials: S
authors.lastname: Ouardi
authors.forename: Gerhard H
authors.initials: GH
authors.lastname: Fecher
authors.forename: Xeniya
authors.initials: X
authors.lastname: Kozina
authors.forename: Gregory
authors.initials: G
authors.lastname: Stryganyuk
authors.forename: Benjamin
authors.initials: B
authors.lastname: Balke
authors.forename: Claudia
authors.initials: C
authors.lastname: Felser
authors.forename: Eiji
authors.initials: E
authors.lastname: Ikenaga
authors.forename: Takeharu
authors.initials: T
authors.lastname: Sugiyama
authors.forename: Naomi
authors.initials: N
authors.lastname: Kawamura
authors.forename: Motohiro
authors.initials: M
authors.lastname: Suzuki
authors.forename: Keisuke
authors.initials: K
authors.lastname: Kobayashi