Abstract:Ca dopants introduce holes in the Mn eg band which allows electronic transport; such samples exhibit a colossal magnetoresistance (CMR) when the sample becomes ferromagnetic at low T, for x in the range 0.2 < x < 0.5. Previous EXAFS studies on the perovskite manganites La 1−xCaxMnO3 indicated a correlation between changes in the local structure associated with polaron formation, and the sample magnetization for these samples. We have extended the EXAFS measurements to a wider range of Ca concentrations and to … Show more
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