  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.
