Out-of-equilibrium electronic transport properties of a misfit cobaltite thin film

被引：10
作者：
Pautrat, A
Eng, HW
Prellier, W
机构：
[1] CNRS, CRISMAT, UMR 6508, F-14050 Caen, France
[2] ENSI Caen, F-14050 Caen, France
来源：
PHYSICAL REVIEW B | 2005年 / 72卷 / 23期
关键词：
D O I：
10.1103/PhysRevB.72.233405
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We report on transport measurements in a thin film of the 2D misfit Cobaltite Ca3Co4O9. 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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页数：4
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