Coulomb blockade and magnetoresistance in granular La1.32Sr1.68Mn2O7 under hydrostatic pressure

►Magnetotransport in a colossal magnetoresistive material La1.32Sr1.68Mn2O7. ► The effect of the forming pressure on the magnetoresistance (MR). ► The grain size effect and charge transfer probability between grains. ► A simple model to explain the negative MR.