MAGNETIC AND OPTICAL-PROPERTIES OF CAVO3-Y

The physical properties of CaVO3-y change from metallic to insulating with increasing oxygen concentration for slightly off-stoichiometric s amples. A detailed study of magnetic properties for the off stoichiome tric chemical composition has been investigated for Ca(x)VO3-y (x=0.97 , 1.00 and 1.03) with various oxidation treatments. The best residual resistance ratio (RRR) is obtained for the sample with stoichiometric Ca and V concentration. Ca0.97VO3-y specially shows growing antiferrom agnetic-like anomaly at 110K and low temperature enhancement with incr easing heat treatment temperature. In addition, optical reflectivity s pectra have been measured for these metallic and insulating samples.