Nuclear magnetic relaxation in Heusler alloys Fe2VGa and Fe2VAl
| Autor: | Keizo Endo, Kiyoshi Ooiwa |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
Nuclear magnetic relaxation
Materials science Condensed matter physics business.industry Knight shift Nuclear magnetic resonance spectroscopy Condensed Matter Physics Electronic Optical and Magnetic Materials Metal Semiconductor Relaxation rate visual_art visual_art.visual_art_medium business Spin relaxation |
| Zdroj: | Journal of Magnetism and Magnetic Materials. :1443-1444 |
| ISSN: | 0304-8853 |
| DOI: | 10.1016/s0304-8853(97)00573-8 |
| Popis: | NMR experiments were performed for 51 V and 27 Al in Fe 2 VGa and Fe 2 VAl. NMR spectrum of 51 V in Fe 2 VGa consists of two lines. The Knight shift of 51 V in Fe 2 VGa is almost zero for the one, and is about + 0.6% for the other, and independent of temperature. The temperature dependence of the relaxation rate, 1/ T 1 , does not follow the Korringa relation. The values of 1/ T 1 are less than that of pure Cu by a factor of 100 at 300 K and a factor of 10 at 4.2 K. These results suggest that these alloys are not metallic but are semiconductors with small energy gaps. |
| Databáze: | OpenAIRE |
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