Kondo effect in the resistivity of CaRu1-xMnxO3

Electrical resistivity rho and the magnetic susceptibility have been measur ed for CaRu1-xMnxO3 (0 less than or equal to x less than or equal to 0.3). The samples are all metallic. The Kondo effect occurred in rho. The Kondo t emperature is about 48 K independent of the Mn concentration, and rho took a minimum value at 310K for r 0.3. Weak ferromagnetic moment and a field co oling effect were induced by the Mn substitution. However, these magnetic b ehaviors may not stem from a canted antiferromagnetism nor itinerant ferrom agnetism which homogeneously prevails in the entire lattice since the occur rence of Kondo effect indicates that some or Mn ions are not involved in a magnetically cooperative state.