Abstract
Magnetoresistive La 0.67− y Y y Ba 0.33MnO 3/LaAlO 3 thin films were prepared by the sol–gel spin-coating method. Our resistivity and the electron spin resonance (ESR) measurements indicate that the main factor determining the metal-insulator transition temperature T m is the cation disorder represented by the cation radii variance σ 2, and that ferromagnetic insulating regions coexist in the ferromagnetic metallic phase. In the paramagnetic phase, the dissociation energy of spin clusters and the polaron hopping energy obtained from the ESR intensity and linewidth also displayed a prominent dependence on σ 2. Polaron localization due to Jahn–Teller distortions appears to be responsible simultaneously for the decrease in the ferromagnetic order and for the increase in the orbital order.
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