Massively strained VO2 thin film growth on RuO2

Abstract

Strain engineering vanadium dioxide thin films is one way to alter this material's characteristic first order transition from semiconductor to metal. In this study we extend the exploitable strain regime by utilizing the very large lattice mismatch of 8.78 % occurring in the VO${}_2$/RuO${}_2$ system along the c axis of the rutile structure. We have grown VO${}_2$ thin films on single domain RuO${}_2$ islands of two distinct surface orientations by atomic oxygen-supported reactive MBE. These films were examined by spatially resolved photoelectron and x-ray absorption spectroscopy, confirming the correct stoichiometry. Low energy electron diffraction then reveals the VO${}_2$ films to grow indeed fully strained on RuO${}_2$(110), exhibiting a previously unreported ($2\times 2$) reconstruction. On TiO${}_2$(110) substrates, we reproduce this reconstruction and attribute it to an oxygen-rich termination caused by the high oxygen chemical potential. On RuO${}_2$(100) on the other hand, the films grow fully relaxed. Hence, the presented growth method allows for simultaneous access to a remarkable strain window ranging from bulk-like structures to massively strained regions.

arXiv comment12 pages, 6 figures. To be published in Crystal Growth & Design

References in corpus (10)

• Scikit-learn: Machine Learning in Python
• Vanadium dioxide : A Peierls-Mott insulator stable against disorder
• Direct Observation of Decoupled Structural and Electronic Transitions and an Ambient Pressure Monoclinic-Like Metallic Phase of VO${}_2$
• Density functional theory study of rutile VO2 surfaces
• Large epitaxial bi-axial strain induces a Mott-like phase transition in VO2
• Epitaxial Growth of VO${}_2$ by Periodic Annealing
• VO2 nanosheets: controlling the THz properties through strain engineering
• Photoemission evidence for crossover from Peierls-like to Mott-like transition in highly strained VO${}_2$
• Tuning a Strain-Induced Orbital Selective Mott Transition in Epitaxial VO${}_2$
• Emergence of metallic monoclinic states of VO${}_2$ films induced by K deposition

Cited by in corpus (4)

• Unraveling the role of V-V dimer on the vibrational properties of VO${}_2$ by first-principles simulations and Raman spectroscopic analysis
• An oxygen-rich, tetrahedral surface phase on high-temperature rutile VO${}_2$(110)${}_{\text{T}}$ single crystals
• First principles studies of the electronic and structural properties of the rutile VO${}_2$(110) surface and its oxygen-rich terminations
• Low-energy electron microscopy intensity-voltage data -- factorization, sparse sampling, and classification