The non-Fermi liquid behaviour of the Heusler-type Fe2+xV1-xAl alloys was investigated with the use of ab initio and many-body methods. Calculations have shown that the narrow d band originating from the impurity Fe atoms is responsible for the unusual temperature dependence of different physical properties of these materials.
PACS numbers: 71.20.Be, 72.80.Ga, 71.10.Hf
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