Visualization of local phase transition behaviors near dislocations in epitaxial VO2/TiO2 thin films

Ahrum Sohn, Teruo Kanki, Hidekazu Tanaka, Dong Wook Kim

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

We investigated local phase transition behaviors in epitaxial VO2/TiO2 thin films using variable-temperature Kelvin probe force microscopy while spanning the metal-insulator transition (MIT). Fully strained thin films were almost free of grain boundaries. In contrast, thicker films had cracks (dislocations) caused by strain relaxation. The surface area fraction of the insulating phase near the dislocations was higher than that in other regions. Thicker films have complicated domain patterns; hence, the three-dimensional percolation model properly described the MIT behaviors. In contrast, the two-dimensional percolation model well explained the transition behaviors of uniformly strained thinner films.

Original languageEnglish
Article number171603
JournalApplied Physics Letters
Volume107
Issue number17
DOIs
StatePublished - 26 Oct 2015

Fingerprint

Dive into the research topics of 'Visualization of local phase transition behaviors near dislocations in epitaxial VO2/TiO2 thin films'. Together they form a unique fingerprint.

Cite this