Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2005-11-02
Physics
Condensed Matter
Strongly Correlated Electrons
accepted in Phys Rev B, Brief reports
Scientific paper
10.1103/PhysRevB.72.233405
We report on transport measurements in a thin film of the 2D misfit Cobaltite $Ca_{3}Co_{4}O_{9}$. 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 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.
Eng H. W.
Pautrat Alain
Prellier Wilfrid
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