Doping and disorder in the Co$_2$MnAl and Co$_2$MnGa half-metallic Heusler alloys

Details Doping and disorder in the Co$_2$MnAl and Co$_2$MnGa half-metallic Heusler alloys Doping and disorder in the Co$_2$MnAl and Co$_2$MnGa half-metallic Heusler alloys

2006-07-25

arxiv.org/abs/cond-mat/0607652v1

Physical Review B 74, 172412 (2006)

Physics

Condensed Matter

Materials Science

Scientific paper

We expand our study on the full-Heusler compounds [I. Galanakis \textit{et al.}, Appl. Phys. Lett. \textbf{89}, 042502 (2006)] to cover also the case of doping and disorder in the case of Co$_2$MnAl and Co$_2$MnGa 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 Co$_2$MnAl retains the half-metallicity contrary to the Co$_2$MnGa 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 the Co$_2$MnZ (Z= Si, Ge, Sn) where it was almost constant. Half-metallicity is no more preserved for both Co$_2$MnAl and Co$_2$MnGa alloys when disorder occurs and there is either excess of Mn or $sp$ atoms.

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