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  Properties of the quaternary half-metal-type Heusler alloy Co2Mn1-xFexSi

Balke, B., Fecher, G. H., Kandpal, H. C., Felser, C., Kobayashi, K., Ikenaga, E., et al. (2006). Properties of the quaternary half-metal-type Heusler alloy Co2Mn1-xFexSi. Physical Review B, 74(10): 104405, pp. 1-10. doi:10.1103/PhysRevB.74.104405.

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Balke, Benjamin1, Author
Fecher, Gerhard H., Author
Kandpal, Hem C.1, Author
Felser, Claudia2, Author           
Kobayashi, Keisuke1, Author
Ikenaga, Eiji1, Author
Kim, Jung-Jin1, Author
Ueda, Shigenori1, Author
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1external, ou_persistent22              
2External Organizations, ou_persistent22              

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 Abstract: This paper reports on the bulk properties of the quaternary Heusler alloy Co2Mn1-xFexSi with the Fe concentration x=0,1/2,1. All samples, which were prepared by arc melting, exhibit L2(1) long-range order over the complete range of Fe concentration. The structural and magnetic properties of the Co2Mn1-xFexSi Heusler alloys were investigated by means of x-ray diffraction, high- and low-temperature magnetometry, Mossbauer spectroscopy, and differential scanning calorimetry. The electronic structure was explored by means of high-energy photoemission spectroscopy at about 8 keV 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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 Dates: 2006-09-05
 Publication Status: Published in print
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Title: Physical Review B
  Other : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 74 (10) Sequence Number: 104405 Start / End Page: 1 - 10 Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008