Magnetoresistivity of CePb2 heavy fermion compound

The dependence of magnetoresistivity on the temperature and the magnetic field for the antiferromagnetic CePb2 heavy fermion compound has been investigated. In the paramagnetic temperature region above the Neel temperature TN = 3.6 K, the magnetoresistivity exhibits a negative magnetic field dependence due to the Kondo effect. From Schlottmann's scaling for the Kondo impurity model, the characteristic Kondo field and the Kondo temperature TK were found to be about 5.1 T and 0.8 K, respectively. The value of TK is relatively in accord with the value evaluated from the paramagnetic Curie temperature and also the relation between TK /TN and a specific heat jump associated with the magnetic ordering. In the antiferromagnetic temperature region, the magnetoresistivity at 2 K shows a broad peak around 6 T, suggesting that the antiferromagnetic spin configuration is changed under applied magnetic field.