Anomalous low-temperature behavior of PrT2B2C and Pr1−xDyxT2B2C(T=Ni,Co)
Journal of Magnetism and Magnetic Materials(2004)
Abstract
We investigated the magnetic, thermal and resistive properties of PrT2B2C(T=Co,Ni) and their solid solutions Pr1−xDyxT2B2C. These compounds behave as normal metallic paramagnets at higher temperatures. At lower temperatures, the parent and the low Dy-substitutions show anomalous features; as an example, their TN are unexpectedly high and, furthermore, the magnetic phase diagram (TN versus x) of Pr1−xDyxT2B2C manifests a strong and non-monotonic dependence on x. At and below liquid helium temperatures and for pressures up to 13kbar, the parent Pr-based compounds manifest a seemingly quadratic-in-temperature resistive contribution which is attributed to a magnon–electron scattering process. We observed that all isobar resistivity curves can be collapsed onto a single curve when plotted against T/To where To (13–15K) is a scaling factor. The combined influence of strong crystalline electric field effects and a weak exchange enhancement on the observed properties of these compounds will be discussed. In particular, the manifestation of a weak exchange enhancement in these compounds and in the isomorph nonmagnetic YCo2B2C will be evaluated.
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Key words
74.70.Dd,75.10.Dq,75.30.Ds
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