Kondo effect in the paramagnetic phase of CrFe alloy with the spin-density-wave suppressed by pressure or V doping

The pressure dependence of the resistivity ρ(T) of (Cr+2.7 at.%Fe)98V2 is measured, following a previous study of the temperature dependence of ρ(T) in the spin-density-wave (SDW) alloy system, (Cr+2.7 at.% Fe)1-x(V,Mn)x. The minimum in ρ(T) in the V-doped alloys seen at T approx-gt TN for x>1 at.% is found to move to lower temperatures under pressure p in the alloy containing 2 at.% V, decreasing in magnitude, and eventually, as the Neel temperature TN goes to zero at p∼10 kbar, becoming a very shallow minimum followed by a maximum and a rapid decrease as T→4.2 K. This latter behavior in the paramagnetic phase is believed to be due to the Kondo effect, while the pressure dependent minimum in ρ(T) in the SDW phase is a manifestation of impurity resonance scattering. copyright 1997 American Institute of Physics