Erratum: Doping and disorder in the CO2MnAl and Co2MnGa half-metallic Heusler alloys
Erratum: Doping and disorder in the CO2MnAl and Co2MnGa half-metallic Heusler alloys
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DOI：
10.1103/physrevb.74.172412
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发表时间：
2006-07
影响因子：
3.7
通讯作者：
K. Özdoğan;E. Şaşıoğlu;B. Aktaş;I. Galanakis
中科院分区：
文献类型：
--
作者：
K. Özdoğan;E. Şaşıoğlu;B. Aktaş;I. Galanakis
We expand our study of the full-Heusler compounds [I. Galanakis et al., Appl. Phys. Lett. 89, 042502 (2006)] to cover also the case of doping and disorder in the case of ${\mathrm{Co}}_{2}\mathrm{Mn}\mathrm{Al}$ and ${\mathrm{Co}}_{2}\mathrm{Mn}\mathrm{Ga}$ half-metallic Heusler alloys. These alloys present a region of very small minority density of states instead of a real gap. Electronic structure calculations reveal that doping with Fe and Cr in the case of ${\mathrm{Co}}_{2}\mathrm{Mn}\mathrm{Al}$ retains half-metallicity contrary to the ${\mathrm{Co}}_{2}\mathrm{Mn}\mathrm{Ga}$ compound. Cr impurities present an unusual behavior, and the spin moment of the Cr impurity scales almost linearly with the concentration of Cr atoms contrary to ${\mathrm{Co}}_{2}\mathrm{Mn}Z$ $(Z=\mathrm{Si},\mathrm{Ge},\mathrm{Sn})$ where it was almost constant. Half-metallicity is no longer preserved for both ${\mathrm{Co}}_{2}\mathrm{Mn}\mathrm{Al}$ and ${\mathrm{Co}}_{2}\mathrm{Mn}\mathrm{Ga}$ alloys when disorder occurs and there is an excess of either Mn or $sp$ atoms.
We expand our study of the full-Heusler compounds [I. Galanakis et al., Appl. Phys. Lett. 89, 042502 (2006)] to cover also the case of doping and disorder in the case of ${\mathrm{Co}}_{2}\mathrm{Mn}\mathrm{Al}$ and ${\mathrm{Co}}_{2}\mathrm{Mn}\mathrm{Ga}$ half-metallic Heusler alloys. These alloys present a region of very small minority density of states instead of a real gap. Electronic structure calculations reveal that doping with Fe and Cr in the case of ${\mathrm{Co}}_{2}\mathrm{Mn}\mathrm{Al}$ retains half-metallicity contrary to the ${\mathrm{Co}}_{2}\mathrm{Mn}\mathrm{Ga}$ compound. Cr impurities present an unusual behavior, and the spin moment of the Cr impurity scales almost linearly with the concentration of Cr atoms contrary to ${\mathrm{Co}}_{2}\mathrm{Mn}Z$ $(Z=\mathrm{Si},\mathrm{Ge},\mathrm{Sn})$ where it was almost constant. Half-metallicity is no longer preserved for both ${\mathrm{Co}}_{2}\mathrm{Mn}\mathrm{Al}$ and ${\mathrm{Co}}_{2}\mathrm{Mn}\mathrm{Ga}$ alloys when disorder occurs and there is an excess of either Mn or $sp$ atoms.