Electrical properties and spin fluctuations studies of Y(Co1−xNix)2 compounds |
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Authors: | P Guzdek J Pszczo?aJ Chmist P Stoch |
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Institution: | a Institute of Electron Technology, 30-701 Kraków, ul.Zab?ocie 39, Poland b Faculty of Physics and Applied Computer Science, AGH, Al. Mickiewicza 30, 30-059 Kraków, Poland c Institute of Atomic Energy, 05-400 ?wierk-Otwock, Poland d Faculty of Material Science and Ceramics, AGH, Al. Mickiewicza 30, 30-059 Kraków, Poland |
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Abstract: | Synthesis by arc melting, the structural and the electric properties of Y(Co1−xNix)2 alloys were studied by X-ray diffraction (XRD) and four probe dc electrical measurements. XRD analysis (300 K) shows that all samples crystallize in a cubic MgCu2-type structure. The lattice parameters linearly decrease with Ni content. Electrical resistivity for the Y(Co1−xNix)2 intermetallic series was measured in a temperature range of 15-1100 K. The parameters involved in the dependence of resistivity on temperature were determined. Residual, phonon and spin fluctuations resistivity were separated from electrical resistivity using both the Matthiesen formula and the Bloch-Gruneisen formula. The spin fluctuations resistivity of the Y(Co1−xNix)2 series are compared to the mean square amplitudes of spin fluctuations previously calculated by the Linear Muffin Tin Orbital-Tight Binding Approach method for these series in the literature. The contribution of spin fluctuations to total resistivity ρsf is proportional to T2 at low temperatures. The proportionality parameter strongly reduces across the Y(Co1−xNix)2 series. |
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Keywords: | Laves phase Crystallography Electrical resistance and other electrical properties Thermoelectric properties Melting Diffraction |
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