Publication
Applied Physics Letters
Paper

Substrate-induced disorder in V 2O 3 thin films grown on annealed c-plane sapphire substrates

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Abstract

We investigate the structural and electronic properties of V 2O 3 thin films deposited by oxygen plasma-assisted molecular beam epitaxy onto annealed and unannealed c-plane sapphire substrates. Annealing the substrates before growth to produce ultra-smooth surfaces improved initial epitaxy, according to in situ reflection high-energy electron diffraction. Surprisingly, films deposited on annealed substrates had a more island-like surface, broader x-ray diffraction peaks, and an increased resistivity of V 2O 3's normally metallic high-temperature phase. We attribute these results to enhanced strain coupling at the interface between the substrate and film, highlighting the vulnerability of V 2O 3's strongly correlated metallic phase to crystalline defects and structural disorder. © 2012 American Institute of Physics.

Date

30 Jul 2012

Publication

Applied Physics Letters

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