文章基本信息

标题：Fractal Nature of Metallic and Insulating Domain Configurations in a VO₂ Thin Film Revealed by Kelvin Probe Force Microscopy
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作者：Ahrum Sohn ; Teruo Kanki ; Kotaro Sakai 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2015
卷号：5
DOI：10.1038/srep10417
出版社：Springer Nature
摘要：We investigated the surface work function ( W _S) and its spatial distribution for epitaxial VO₂/TiO₂ thin films using Kelvin probe force microscopy (KPFM). Nearly grain-boundary-free samples allowed observation of metallic and insulating domains with distinct W _S values, throughout the metal–insulator transition. The metallic fraction, estimated from W _S maps, describes the evolution of the resistance based on a two-dimensional percolation model. The KPFM measurements also revealed the fractal nature of the domain configuration.