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The magnetic transport properties have been measured for La0.67-xYxCa0.33MnO3(0 <= x <= 0.14) system. It was found that the transition temperature Tp almostlinearly moves to higher temperature as H increases. Electron spin resonanceconfirms that above Tp, there exist ferromagnetic clusters. From the magneticpolaron point of view, the shift of Tp vs. H was understood, and it wasestimated that the size of the magnetic polaron is of 9.7~15.4 angstrom whichis consistent with the magnetic correlation length revealed by the small-angleneutron-scattering technique. The transport properties at temperatures higherthan Tp conform to the variable-range hopping mechanism.Comment: 22 pages, 6 figures, pdf, to be published in Euro. Phys. J.

Insulator-metal transition shift related to magnetic polarons in La 0.67- xY xCa 0.33MnO 3