Giant magnetoresistive behavior near the metamagnetic transition in Ce(Fe0.93Ru0.07)2

Abstract

We present detailed measurements of the field and temperature dependence of the resistivity and magnetization of Ce(${\mathrm{Fe}}_{0.93}$ ${\mathrm{Ru}}_{0.07}$ ${)}_2$. This system undergoes a ferromagnetic to antiferromagnetic transition near 115 K in zero field; applied fields suppress the temperature at which this transition occurs and a nonconventional giant magnetoresistance results associated with this field-induced suppression. The detailed features in this magnetoresistance are correlated with the corresponding change in the field- and temperature-dependent magnetization, and model calculations attempting to relate these two properties are presented. © 1996 The American Physical Society.