Metal-Insulator Transition with Oxygen Content in CaVO3-y

To date, CaVO 3- y has been reported and believed to be one of the typical metallic oxides. From our detailed study, however, it has been found that this system shows insulating properties with stoichiometric oxygen content. This insulator phase was obtained by oxidation of as-cast single crystals. The magnetic susceptibility of this stoichiometric sample shows an antiferromagnetic like kink around 170 K.