Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1998-11-27
Solid State Comm. Vol 106, No. 3 pp 169-172 (1998)
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 3 figures, RevTex
Scientific paper
10.1016/S0038-1098(98)00012-X
The results of heat-capacity, magnetic susceptibility, electrical resistivity and magnetoresistance $(\Delta \rho/\rho)$ 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 $\Delta \rho/\rho $ 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.
Mallik R.
Paulose P. L.
Sampathkumaran E. V.
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