Evolution of magnetism in

The magnetic properties of polycrystalline Tb (Co x Ni 1 - x) 2 B 2 C (x=0.2,0.4,0.6,0.8) samples were probed by magnetization, specific heat, ac susceptibility, and resistivity techniques. For x aNB 0.4 , the curves obtained are consistent with the features expected for the corresponding magnetic m...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2013-06, Vol.335, p.163-171
Main Authors: ElMassalami, M, Gomes, A M, Paiva, T, dos Santos, RR, Takeya, H
Format: Article
Language:English
Subjects:
Critical temperature
Deviation
Electrical resistivity
Evolution
Magnetic moment
Magnetic permeability
Magnetism
Magnetization
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Summary:The magnetic properties of polycrystalline Tb (Co x Ni 1 - x) 2 B 2 C (x=0.2,0.4,0.6,0.8) samples were probed by magnetization, specific heat, ac susceptibility, and resistivity techniques. For x aNB 0.4 , the curves obtained are consistent with the features expected for the corresponding magnetic modes, namely k 1 = (0.55 , 0 , 0) at x=0; k 2 = (1 2 , 0 , 1 2) at x = 0.2 and 0.4; k 3 = (0 , 0 , 1 3) at x = 0.6 , and k 4 = (0 , 0 , 0) at x=0.8 and 1. For each of these compositions, we thoroughly discuss the analyses leading to the determination of the magnetic critical temperature through separate independent measurements. For x=0.4, even though neutron diffraction indicates a k 2 mode (but with a reduced magnetic moment) the magnetization, the ac susceptibility, and resistivity indicate two magnetic events, in sharp contrast with other concentrations, for which a single critical event is observed; furthermore, deviation from Curie-Weiss behavior is observed below 150 K for this sample. These features, together with the evolution of both magnetic moment and critical temperature, are attributed to a combination of crystalline electric field effects and an interplay between competing magnetic couplings.
ISSN:0304-8853