تقرير
The nanostructural origin of the ac conductance in dielectric granular metals: the case study of Co_20(ZrO_2)_80
| العنوان: | The nanostructural origin of the ac conductance in dielectric granular metals: the case study of Co_20(ZrO_2)_80 |
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| المؤلفون: | Konstantinovic, Z, del Muro, M Garcia, Batlle, X, Labarta, A, Varela, M. |
| المصدر: | Appl. Phys. Lett. 91, 052108 (2007) |
| سنة النشر: | 2007 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Materials Science, Condensed Matter - Disordered Systems and Neural Networks |
| الوصف: | 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. Comment: Available online at: http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=APPLAB000091000005052108000001&idtype=cvips&gifs=yes |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1063/1.2766858 |
| URL الوصول: | http://arxiv.org/abs/0708.2140 |
| رقم الأكسشن: | edsarx.0708.2140 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1063/1.2766858 |
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