Insulator-metal transition shift related to magnetic polarons in La0.67-xYxCa0.33MnO3

Details Insulator-metal transition shift related to magnetic polarons in La0.67-xYxCa0.33MnO3 Insulator-metal transition shift related to magnetic polarons in La0.67-xYxCa0.33MnO3

2003-01-16

arxiv.org/abs/cond-mat/0301283v1

Physics

Condensed Matter

Strongly Correlated Electrons

22 pages, 6 figures, pdf, to be published in Euro. Phys. J. B

Scientific paper

10.1140/epjb/e2003-00068-8

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 almost linearly moves to higher temperature as H increases. Electron spin resonance confirms that above Tp, there exist ferromagnetic clusters. From the magnetic polaron point of view, the shift of Tp vs. H was understood, and it was estimated that the size of the magnetic polaron is of 9.7~15.4 angstrom which is consistent with the magnetic correlation length revealed by the small-angle neutron-scattering technique. The transport properties at temperatures higher than Tp conform to the variable-range hopping mechanism.

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