1998/12/04 by R. Mallik, E. V. Sampathkumaran, P. L. Paulose +1
Physics and Astronomy · #cond-mat.str-el
published as Phys. Review B Vol. 55 No. 14, R8650 (1997) · 4 pages Text (RevTex), 3 Postscript Figures (separate)
arxiv created 1998/12/04 · arxiv updated 2009/11/30
The results of magnetoresistance (Δρ/ρ)measurements in GdNi, in the temperature range 4.2 to 300 K are reported. The sign of Δρ/ρ above the Curie temperature (Tc= 70 K) is negative and its magnitude in a magnetic field of 80kOe grows with decreasing temperature below 150 K with a peak value of about -20% at Tc. These features, qualitatively resembling those in giant magnetoresistance systems (manganates), are attributed to the formation of some kind of magnetic polarons induced by Gd. The magnetoresistance changes sign below 12 K which is attributed to subtle band structure effects.