Influence of Fe3+ on perovskite oxides: La2/3Ca1/3Mn1-x Fe x O3
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The structure and magnetoresistance properties in sintered samples of La2/3Ca1/3Mn1-x Fe x O3(0≤x≤0.84) are studied by using Mössbauer spectroscopy, XRD and magnetic measurement. There are antiferromagnetic interactions between Fe and its nearest neighbors (Fe, Mn) when 0 <x ≤0.67, which are important factors influencing the double-exchange between Mn3+ and Mn4+, Curie temperature, magnetic moment and GMR. It is suggested that the Mn3+ (Fe3+) /Mn4+ system also consists of magnetic clusters with different sizes.
Keywordsgiant magnetoresistance Mössbauer spectroscopy antiferromagnetic interaction magnetic cluster
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