Abstract
The perovskite-type alloy system Y1-xCaxTiO3 has the magnetic transition near x=0.1 and the metal to insulator (M-I) transition near x=0.3. This system is found to be classified into the following three categories by the measurements of magnetic and electrical properties, (i) In the Y-rich region (0<x<0.1), this alloy system shows ferromagnetic and semiconducting behaviour, (ii) In the middle region (0.1<x<0.3), the temperature dependence of magnetic susceptibility shows Curie-Weiss type paramagnetic behaviour but transport property shows semiconducting behaviour, (iii) In the Ca-rich region (0.3<x<1), the alloy shows metallic transport and Pauli-paramagnetic behaviours.
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