Out of equilibrium electronic transport properties of a misfit cobaltite thin film
arXiv:cond-mat/0511051 · doi:10.1103/PhysRevB.72.233405
Abstract
We report on transport measurements in a thin film of the 2D misfit Cobaltite . 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 telegraphic-like 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 glassy-like and are not directly coupled to the electronic part.
arXiv commentaccepted in Phys Rev B, Brief reports
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