Low temperature magnetotransport properties of La0.55Ho0.15Sr0.3MnO3

Magnetotransport data measured in thin films of La0.55Ho0.15Sr0.3MnO3 down to very low temperatures (0.25 K) are reported. The samples presented colossal magnetoresistance with a T-C close to 200 K. A minimum in the resistance vs. T curve and a drop in the ZFC magnetization were also observed. It was also found a T-dependent relaxation effect after the magnetic field was either applied or removed. These results can be understood within the framework where electronic scattering occurs across magnetic domain walls in a reentrant spin-glassy-like phase. (C) 2002 Elsevier Science B.V. All rights reserved.