Structure, Magnetic, and Electrical Properties of the R2NiGe3 compounds (R=Y and Rare earth)
Date Issued
2007
Date
2007
Author(s)
Wang, Cheng-Hsiang
DOI
en-US
Abstract
We have successfully synthesized the rare earth ternary intermetallics R2NiGe3 (R = Y, La, Ce, Pr, Nd, Sm, Gd, Dy, and Ho), which crystallized in a AlB2-derived hexagonal structure with space group P6/mmm as confirmed from the X-ray diffraction measurements. Except Sm2NiGe3, all the samples have additional peak which is due to a parasitic phase with the stoichiometry 1:2:2.
Magnetic behavior and electrical resistivity are investigated on this compound. Curie-Weiss law is used to calculate the effective moments of the rare earth ions in the paramagnetic state. The magnetization measurements indicate that Y2NiGe3 and La2NiGe3 are not superconductors above 2 K, and the R2NiGe3 compounds (R = Gd, and Dy) ordered antiferromagnetically at low temperatures.
For Ce2NiGe3 compound, the magnetic resistivity show as -lnT dependence from room temperature to 80 K and other portion of a very faint -lnT dependence from 20 K to 6 K. The magnetic resistivity increases as the temperature is lowered, instead of steadily decreasing, and decreases with the decrease of the temperature below 6 K, this magnetic contribution to the resistivity is similar to that of a Kondo lattice system.
Subjects
AlB2結構
R2NiGe3 compounds
Type
thesis
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