  CaRuO3 is a perovskite with an orthorhombic distortion and shows the
characteristics of spin-glass behavior below TC=87 K. The La3+ substitution for
Ca2+ in Ca1-xLaxRuO3 samples, induces a disorder in the Ca site (the A site)
and the system becomes antiferromagnetically (AFM) ordered with TN = 58 and 19
K for x=0.1 x=0.5 respectively. In the Ca1-xSrxRuO3 system, the Ca0.8Sr0.2RuO3
sample is canted-AFM ordered at 107 K. The compounds with higher Sr
concentration display ferromagnetic behavior and the saturation moment
increases with Sr. Huge magnetic hysteresis loops are obtained at low
temperatures. The coercive field (HC) decreases with Sr. For x=0.4 HC =9.5 kOe
(at 5 K) whereas for SrRuO3 HC =2.4 kOe. For x=0.4 and 0.6, HC decreases
sharply with temperature and than increases again with a peak at 95 and 115 K,
respectively. On the other hand, for SrRuO3, HC remains practically unchanged
up to 50 K and shows a peak at 90 K and than decrease sharply up to TC =165 K.
