Physics – Condensed Matter – Materials Science
Scientific paper
2007-08-16
Appl. Phys. Lett. 91, 052108 (2007)
Physics
Condensed Matter
Materials Science
Available online at: http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=APPLAB000091000005052108000001&idtyp
Scientific paper
10.1063/1.2766858
We show which is the nanostructure required in granular Co20(ZrO2)80 thin films to produce an ac response such as the one that is universally observed in a very wide variety of dielectric materials. A bimodal size distribution of Co particles yields randomly competing conductance channels which allow both thermally assisted tunneling through small particles and capacitive conductance among larger particles that are further apart. A model consisting on a simple cubic random resistance-capacitor network describes quantitatively the experimental results as functions of temperature and frequency, and enables the determination of the microscopic parameters controlling the ac response of the samples.
Batlle Xavier
del Muro Montserrat Garcia
Konstantinovic Zorica
Labarta Amilcar
Varela Manuel
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