57Fe Hyperfine Interactions in the Sc(Fe1-xNix)2 Laves Phases Synthesized under High Pressure |
| M. Wiertel a, Z. Surowiec a, M. Budzyński a, and A.V. Tsvyashchenko b a Institute of Physics, M. Curie-Skłodowska University, pl. M. Curie-Skłodowskiej 1, 20-031 Lublin, Poland b Vereshchagin Institute for High Pressure Physics, Russian Academy of Sciences, Troitsk 142190, Moscow Region, Russia |
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| Received: 08 06 2008 |
| The structural and microscopic magnetic properties of the pseudobinary Sc(Fe1-xNix)2 system prepared under high pressure of 8 GPa were studied by X-ray diffraction and Mössbauer measurements in the range of 0.0 ≤ x ≤ 0.60. The samples for 0.0 ≤ x ≤ 0.10 have the hexagonal C14-type structure and those for 0.30 ≤ x ≤ 0.60 crystallize in the C15-type structure. Both the magnetic hyperfine field on 57Fe and the Curie temperature decrease with the increasing Ni content and the system becomes paramagnetic for x ≈ 0.60 at room temperature. The form and temperature dependences of the Mössbauer spectra for 0.40 ≤ x ≤ 0.50 indicate the coexistence of paramagnetic and ferromagnetic regions in the samples and occurrence of magnetic clusters with a wide distribution of the Curie temperatures. It is interesting that TC for the compounds obtained under high pressure are by about 100 K smaller in comparison with those for the isostructural samples produced under normal pressure even though interatomic distances are practically equal in the both types of compounds. |
| DOI: 10.12693/APhysPolA.114.1517 PACS numbers: 76.80.+y, 77.80.Bh, 75.30.Kz, 07.35.+k |