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Low-(LFMR) and high-field (HFMR) magnetoresistance of ceramic La 23 Sr 13 MnO 3 samples with different grain sizes (20 nm < O < 10 μm) have been investigated. A limiting LFMR of about ~30% is obtained for O ~0.5 μm with no increase in further reductions of the grain size. Neverthless, the HFMR progressively rises when reducing the grain size. Experimental results...
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