Symmetry of Valence States of Heusler Compounds Explored by Linear Dichroism in Hard-X-Ray Photoelectron Spectroscopy

Siham Ouardi, Gerhard H. Fecher, Xeniya Kozina, Gregory Stryganyuk, Benjamin Balke, Claudia Felser, Eiji Ikenaga, Takeharu Sugiyama, Naomi Kawamura, Motohiro Suzuki, and Keisuke Kobayashi
Phys. Rev. Lett. 107, 036402 – Published 12 July 2011
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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=7.938keV. 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.

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  • Received 13 August 2010

DOI:https://doi.org/10.1103/PhysRevLett.107.036402

© 2011 American Physical Society

Authors & Affiliations

Siham Ouardi, Gerhard H. Fecher*, Xeniya Kozina, Gregory Stryganyuk, Benjamin Balke, and Claudia Felser

  • Institut für Anorganische und Analytische Chemie, Johannes Gutenberg–Universität, 55099 Mainz, Germany

Eiji Ikenaga, Takeharu Sugiyama, Naomi Kawamura, and Motohiro Suzuki

  • Japan Synchrotron Radiation Research Institute, SPring-8, Hyogo 679-5198, Japan

Keisuke Kobayashi

  • National Institute for Materials Science, SPring-8, Hyogo 679-5148, Japan

  • *fecher@uni-mainz.de

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Issue

Vol. 107, Iss. 3 — 15 July 2011

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