Electronic and crystallographic structure, hard x-ray photoemission, and mechanical and transport properties of the half-metallic Heusler compound Co2MnGe

Siham Ouardi, Gerhard H. Fecher, Benjamin Balke, Andreea Beleanu, Xeniya Kozina, Gregory Stryganyuk, Claudia Felser, Werner Klöß, Hartmut Schrader, Fabiano Bernardi, Jonder Morais, Eiji Ikenaga, Yoshiyuki Yamashita, Shigenori Ueda, and Keisuke Kobayashi
Phys. Rev. B 84, 155122 – Published 17 October 2011

Abstract

This work reports on the electronic and crystalline structure and the mechanical, magnetic, and transport properties of the polycrystalline Heusler compound Co2MnGe. The crystalline structure was examined in detail by extended x-ray absorption fine-structure spectroscopy and anomalous x-ray diffraction. The compound exhibits a well-ordered L21 structure as is typical for Heusler compounds with 2:1:1 stoichiometry. The low-temperature magnetic moment agrees well with the Slater-Pauling rule and indicates a half-metallic ferromagnetic state of the compound, as is predicted by ab initio calculations. Transport measurements and hard x-ray photoelectron spectroscopy were performed to explain the electronic structure of the compound. The obtained valence band spectra exhibit small energy shifts that are the result of the photoexcitation process, whereas electron-electron correlation in the ground state is negligible. The vibration and mechanical properties of the compound were calculated. The observed hardness values are consistent to a covalent-like bonding of Co2MnGe.

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  • Received 17 July 2011

DOI:https://doi.org/10.1103/PhysRevB.84.155122

©2011 American Physical Society

Authors & Affiliations

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

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

Werner Klöß and Hartmut Schrader

  • Fachbereich Maschinenbau und Kunststofftechnik, Hochschule Darmstadt, D-64295 Darmstadt, Germany

Fabiano Bernardi and Jonder Morais

  • Instituto de Fisica, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil

Eiji Ikenaga

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

Yoshiyuki Yamashita, Shigenori Ueda, and Keisuke Kobayashi

  • NIMS Beamline Station at SPring-8, National Institute for Materials Science, Hyogo 679-5148, Japan

  • *fecher@uni-mainz.de

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Issue

Vol. 84, Iss. 15 — 15 October 2011

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