Abstract
We report on transport measurements in a thin film of the 2D misfit Cobaltite ${\mathrm{Ca}}_{3}{\mathrm{Co}}_{4}{\mathrm{O}}_{9}$. Dc magnetoresistance measurements obey the modified variable range hopping law expected for a soft Coulomb gap. When the sample is cooled down, we observe large telegraphiclike fluctuations. At low temperature, these slow fluctuations have non-Gaussian statistics and are stable under a large magnetic field. These results suggest that the low temperature state is a glassy electronic state. Resistance relaxation and memory effects of pure magnetic origin are also observed, but without aging phenomena. This indicates that these magnetic effects are not glassylike and are not directly coupled to the electronic part.
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