Magnetic and galvanomagnetic properties of CeMn2(GexSi1-x)2 solid solutions in magnetic fields up to 13 T

The magnetoresistance and magnetization in magnetic fields up to 13 T have been investigated for the CeMn2(GexSi1-x)2 solid solutions depending on composition. The intermediate valence state, the Kondo lattice state or the stable state of the Ce ions co-exist with the anti-ferromagnetic or ferromagnetic state of the Mn sublattice. For some of samples the Hall effect was measured. The substitution of Si→Ge leads to the increase of the magnetoresistance [R(B)-R(0)]/R(0). At 4.2 K and in a magnetic field of 13 T it changes its value from+70% for x=0 to ≤ vertical stroke ±5 vertical stroke % for x≥0.3. The behaviour of the galvanomagnetic effects is discussed. (orig.)