The magnetoresistive behavior of Cr-doped manganites Pr0.44Sr0.56MnO3
  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. 
Z. Jirak (1), J. Hejtmanek (1), K. Knizek (1), M. Marysko (1), C.   Martin (2), A. Maignan (2), M. Hervieu (2) ((1) Institut...