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Large Low Temperature Magnetoresistance and Magnetic Anomalies in Tb$_2$PdSi$_3$ and Dy$_2$PdSi$_3$

R. Mallik·E. V. Sampathkumaran·P. L. Paulose
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Abstract

The results of heat-capacity, magnetic susceptibility, electrical resistivity and magnetoresistance $(Δρ/ρ)$ measurements on the compounds Tb$_2$PdSi$_3$ and Dy$_2$PdSi$_3$, are reported. The results establish that these compounds undergo long-range magnetic ordering (presumably with a complex magnetic structure) below (Tc=) 23 and 8 K respectively. The $Δρ/ρ$ is negative in the vicinity of Tc and the magnitude grows as Tc is approached from higher temperature as in the case of well-known giant magnetoresistance systems (La manganite based perovskites); this is attributed to the formation of some kind of magnetic polarons. The magnitude of magnetoresistance at low temperatures is quite large, for instance, about 30% in the presence of 60 kOe field at 5 K in the Dy sample.

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R. Mallik, E. V. Sampathkumaran, P. L. Paulose. 1998-11-27. Large Low Temperature Magnetoresistance and Magnetic Anomalies in Tb$_2$PdSi$_3$ and Dy$_2$PdSi$_3$. https://doi.org/10.1016/s0038-1098(98)00012-x

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