Electron Spin Resonance Study on CMR Oxides

R. Gundakaram; J. G. Lin; C. S. Lee; P. C. Kuo; C. Y. Huang

doi:10.3379/jmsjmag.23.531

7.2 Oxides

Electron Spin Resonance Study on CMR Oxides

R. Gundakaram, J. G. Lin, C. S. Lee, P. C. Kuo, C. Y. Huang

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Keywords: electron spin resonance (ESR), size effect, activation energy, substitution effects, CMR oxides

JOURNAL OPEN ACCESS

1999 Volume 23 Issue 1_2 Pages 531-533

DOI https://doi.org/10.3379/jmsjmag.23.531

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Abstract

Electron spin resonance (ESR) measurements have been performed on samples of the systems Pr_0.7Sr_0.3-xCa_xMnO₃ and Pr_0.6Sr_0.4-yCa_yMnO₃. 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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