Abstract
Electron spin resonance (ESR) measurements have been performed on samples of the systems Pr0.7Sr0.3-xCaxMnO3 and Pr0.6Sr0.4-yCayMnO3. Substitution of Ca in the Sr site changes the effective ionic radius of the A-site without altering the average Mn valence. The variation in the resonance linewidth and the activation energy as a function of Ca content is presented and the observed features are explained on the basis of the change in the tolerance factor.
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