Hall effect in the magnetic kondo-lattice of CeAl2

Temperature and magnetic field dependences of the Hall coefficient R(T, H) and transverse magnetoresistance Δrhosub(perpendicular) (H)/rho(0) are investigated in the magnetic Kondolattice of CeAl2. Measurements are made at temperatures 1.8 K <= T <= 300 K in magnetic field H <= 40 kOe using policrystalline samples of CeAl2. The Hall coefficient measured in magnetic field H0 <= 8 kOe is increased by a factor of 4, when temperature is lowered from T approximately 100 K to the antiferromagnetic transition temperature T=T0=3.8 K. When magnetic field H0 rises, the ratio r=R(T=3.8 K, H0)/R(T=100 K, H0) is diminished and at H=H0=40 kOe ratio r is about 2. Magnetoresistance Δrhosub(perpendicular) (H)/rho (0) is negative and passes through the maximum at the temperature T=T0=3.7 K for the magnetic field H=16 kOe. The temperature T0 corresponding to the maximum absolute value of magnetoresistance is lowered at higher magnetic field H with the derivative dT0/dH approximately equal to 0.058 K/kOe. These data are analysed in the framework of a model taking into account both the appearance of the Abrikosov - Suhl resonance near the Fermi level and skew scattering leading to the anomalous Nall effect