Magnetic studies of the lightly Ru doped perovskite rhodates Sr(Ru,Rh)O3

The solid solution between the ferromagnetic metal SrRuO3 and the enhanced paramagnetic metal SrRhO3 was recently reported (Phys. Rev. B 69 (2004) 024410), and an unexpected feature was found in the specific heat data at x=0.9 of SrRu1-xRhxO3. The feature was reinvestigated further by characterizing additional samples with various Ru concentrations in the vicinity of x=0.9. Specific heat and magnetic susceptibility data indicate that the feature reflects a peculiar magnetism of the doped perovskite, which appears only in the very narrow composition range 0.8