Measurements of magnetoresistance and magnetization were carried out on ceramic samples of [formula omitted] and [formula omitted] containing 10 at. % Ag in a dispersed form. The results obtained for the resistivity at zero applied magnetic field exhibit a shallow minimum at the temperature [formula omitted] K which shifts towards lower temperatures upon applying a magnetic field and disappears at a certain field [formula omitted] Also the resistivity at helium temperature decreases upon applying magnetic fields. It is shown that the model of charge carriers tunneling between antiferromagnetically coupled grains may account for the results observed.
ASJC Scopus subject areas
- Physics and Astronomy (all)