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In order to assess the magnetic ordering process in Fe2VAl and the relatedmaterial Fe2VGa, we have carried out nuclear magnetic resonance (NMR) andMossbauer studies. 27Al NMR relaxation measurements covered the temperaturerange 4 -- 500 K in Fe(2+x)V(1-x)Al samples. We found a peak in the NMRspin-lattice relaxation rate, 27T1^-1, corresponding to the magnetictransitions in each of these samples. These peaks appear at 125 K, 17 K, and165 K for x = 0.10, 0, and - 0.05 respectively, and we connect these featureswith critical slowing down of the localized antisite defects. Mossbauermeasurements for Fe2VAl and Fe2VGa showed lines with no hyperfine splitting,and isomer shifts nearly identical to those of the corresponding sites in Fe3Aland Fe3Ga, respectively. We show that a model in which local band filling leadsto magnetic regions in the samples, in addition to the localized antisitedefects, can account for the observed magnetic ordering behavior.Comment: 5 pages, 3 figure

physical review. b, condensed matter

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NMR and Mössbauer study of spin dynamics and electronic structure ofFe2+xV1−x<…