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- W2034971723 abstract "Abstract We have investigated the crystal structure, electrical, and magnetic properties of the RCu 3 Al 2 (R = rare earth ions) compounds by means of the powder X-ray diffraction, AC electrical resistivity ρ , and DC magnetic susceptibility χ measurements. Powder X-ray diffraction patterns reveal that all the samples studied are of the hexagonal CaCu 5 -type structure with space group P 6/ mmm and the lattice constants a and c are observed to decrease monotonically with increasing atomic number of R. The ooccurrence of a peak in the χ ( T ) curve and a drop off in the ρ ( T ) curve at the corresponding temperatures indicate that antiferromagnetic transition occurs in TbCu 3 Al 2 and DyCu 3 Al 2 with transition temperature T N of 6 and 5 K, respectively. For SmCu 3 Al 2 and GdCu 3 Al 2 , ferromagnetic orderings are observed with T c = 12 and 20 K, respectively. Except for SmCu 3 Al 2 , the χ ( T ) curves for all samples follow the Curie–Weiss behavior for T > 100 K, with the obtained values of μ eff close to the moment of the corresponding R 3+ ions. The ρ ( T ) curve for CeCu 3 Al 2 reveals characteristics of a Kondo system which can be described by ρ ( T ) = ρ 0 + αT − β ln T , with ρ 0 = 622.43 μΩcm, α = 0.2783 μΩcm/K and β = 71.92 μΩcm/K." @default.
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- W2034971723 date "2007-09-01" @default.
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- W2034971723 title "Electrical and magnetic properties of RCu3Al2 (R=rare earth ions) compounds" @default.
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- W2034971723 doi "https://doi.org/10.1016/j.jallcom.2006.09.150" @default.
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