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Type: Artigo de periódico
Title: Infrared reflectivity of Co-x(SiO2)(1-x)(x similar to 0.85, 0.55, 0.38) granular films on SiO2 glass substrates
Author: Massa, NE
Denardin, JC
Socolovsky, LA
Knobel, M
de la Cruz, FP
Zhang, XX
Abstract: We report the infrared specular reflectivity of Co-x(SiO2)(1-x) (x similar to 0.85, 0.55, 0.38) films on SiO2 glass spanning from a metal-like to insulating behavior. While films for x similar to 0.85 show carrier metallic shielding and hopping conductivity, for x similar to 0.65 and lower concentrations, the nanoparticles' number and size promote a localization edge near the highest longitudinal optical frequency. Such an edge is associated with a reflectivity minimum and a higher frequency band connoting strong electron-phonon interactions, carrier phonon assisted hopping, and polaron formation. Optical conductivity fits with current polaron models provide grounds toward a microscopic understanding of transport properties in these as-prepared granular films. (C) 2007 Elsevier Ltd. All rights reserved.
Subject: granular films
optical properties
electron-phonon interactions
light absorption and reflection
Country: Inglaterra
Editor: Pergamon-elsevier Science Ltd
Rights: fechado
Identifier DOI: 10.1016/j.ssc.2006.12.019
Date Issue: 2007
Appears in Collections:Unicamp - Artigos e Outros Documentos

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