Magnetic relaxation and magnetization field dependence measurements in   La0.5Ca0.5MnO3
  We reported a systematic change in the average magnetic relaxation rate, after the application and removal of a 5 T magnetic field, in a polycrystalline sample of La0.5Ca0.5MnO3. Magnetic relaxation measurements and magnetization versus field curves were taken from 10 K to 160 K. The long time behavior of the relaxation curves was approximately logarithmic in all cases. Keywords: Charge Ordering, Relaxation, Magnetic measurements 
J. Lopez, P. N. Lisboa-Filho, W. A. C. Passos, W. A. Ortiz and F. M.   Araujo-Moreira (UFSCar, Brazil)