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arxiv: cond-mat/0212517 · v2 · submitted 2002-12-20 · ❄️ cond-mat.mtrl-sci

The magnetoresistive behavior of Cr-doped manganites Pr0.44Sr0.56MnO3

Z. Jirak (1) , J. Hejtmanek (1) , K. Knizek (1) , M. Marysko (1) , C. Martin (2) , A. Maignan (2) , M. Hervieu (2) ((1) Institute of Physics of ASCR , Prague
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Czech Republic (2) Laboratoire CRISMAT Caen France)
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classification ❄️ cond-mat.mtrl-sci
keywords magneticbehaviordopingmno3samplesa-typeantiferromagnetbroad
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A complex structural, magnetic and electric transport investigation shows that the Cr doping on Mn sites in the A-type antiferromagnet Pr0.44Sr0.56MnO3 provokes a non-uniform magnetic state with coexisting FM and AFM regions. Irrespective of the ratio of magnetic phases, the samples exhibit a non-metallic behavior of resistivity and thermopower, pointing to the nanoscopic nature of the phase separation. A particularly large magnetoresistance encountered in a broad range of temperatures for samples with Cr doping of 4 - 6 % supports such idea.

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