Abstract
We report a comprehensive study of the electrical and magneto-transport properties of La1.32Sr1.68Mn2O7 layered manganite system under different pressures and in the temperature range of 4.2K to 300K. An increase in the resistivity at low temperature has been observed and explained in terms of Coulomb Blockade effect. Magnetoresistance data are explained by assuming that the transport occurs through the mechanism of intergranular as well as granular paths with a pronounced manifestation of Spin Polarization Tunneling phenomenon. By qualitatively comparing the relative fractions of these channels, we explain the resistivity behavior in each temperature range.
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