Properties of the quaternary half-metal-type Heusler alloy Co2Mn1xFexSi

Benjamin Balke, Gerhard H. Fecher, Hem C. Kandpal, Claudia Felser, Keisuke Kobayashi, Eiji Ikenaga, Jung-Jin Kim, and Shigenori Ueda
Phys. Rev. B 74, 104405 – Published 5 September 2006

Abstract

This paper reports on the bulk properties of the quaternary Heusler alloy Co2Mn1xFexSi with the Fe concentration x=0,12,1. All samples, which were prepared by arc melting, exhibit L21 long-range order over the complete range of Fe concentration. The structural and magnetic properties of the Co2Mn1xFexSi Heusler alloys were investigated by means of x-ray diffraction, high- and low-temperature magnetometry, Mössbauer spectroscopy, and differential scanning calorimetry. The electronic structure was explored by means of high-energy photoemission spectroscopy at about 8keV photon energy. This ensures true bulk sensitivity of the measurements. The magnetization of the Fe-doped Heusler alloys is in agreement with the values of the magnetic moments expected for a Slater-Pauling-like behavior of half-metallic ferromagnets. The experimental findings are discussed on the basis of self-consistent calculations of the electronic and magnetic structure. To achieve good agreement with experiment, the calculations indicate that on-site electron-electron correlation must be taken into account, even at low Fe concentration. The present investigation focuses on searching for the quaternary compound where the half-metallic behavior is stable against outside influences. Overall, the results suggest that the best candidate may be found at an iron concentration of about 50%.

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  • Received 7 March 2006

DOI:https://doi.org/10.1103/PhysRevB.74.104405

©2006 American Physical Society

Authors & Affiliations

Benjamin Balke, Gerhard H. Fecher, Hem C. Kandpal, and Claudia Felser*

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

Keisuke Kobayashi, Eiji Ikenaga, Jung-Jin Kim, and Shigenori Ueda

  • Japan Synchrotron Radiation Research Institute (SPring-8/JASRI), Kouto 1-1-1, Mikaduki-cho, Sayou-gun, Hyogo, 679-5198, Japan

  • *Electronic address: fecher@uni-mainz.de

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Issue

Vol. 74, Iss. 10 — 1 September 2006

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