Comparison of the magnetic properties of isoelectronic Sr-x(Na0.5La0.5)(1-x)RuO3 and SrxCa1-xRuO3 perovskites - art. no. 024402

The solid solution Sr-x(Na0.5La0.5)(1-x)RuO3 (0 less than or equal to x les s than or equal to 1) is reported, and its structural, electronic, and magn etic properties are compared to isoelectronic SrxCa1-xRuO3. The suppression of ferromagnetic interactions in SrxCa1-xRuO3 has frequently been attribut ed to the orthorhombic structural distortion, either through the crossover to classical antiferromagnetic interactions, or to a nearly ferromagnetic m etal. Comparison of the magnetic properties of Sr-x(Na0.5La0.5)(1-x)RuO3 to SrxCa1-xRuO3, however, shows that there is a much faster suppression of fe rromagnetic interactions in the former case. Neither orthorhombic distortio n nor cation size disorder can explain the observed difference. Instead, th e difference may be attributed to charge disorder an the site, which affect s the local environment of Ru atoms greatly and leads to the faster suppres sion of the long-rant ferromagnetic state.