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A good field to develop new materials with half metallicity is the
quaternary Heusler alloys. The preferred route is to combine the
compounds that have been already grown in Heusler structure. As a
typical example, the quaternary LiMgPdSb-type CoFeMnSi have been
investigated in detail. For the quaternary LiMgPdSb-type compounds,
three nonequivalent structures exist. From the calculated density of
state (DOS) results, it can be seen that one superstructure shows half
metallicity. The second superstructure has a pseudogap at the Fermi
level. The third superstructure shows metallic behavior. Based on the
analysis of the measured XRD pattern and magnetization curve, we can
deduce that the CoFeMnSi compound is crystallized in the structure where
half metallicity occurs. (C) 2009 American Institute of Physics. [DOI:
10.1063/1.3062812]
