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Title: Directly measuring the structural transition pathways of strain-engineered VO2 thin films

Journal Article · · Nanoscale
DOI:https://doi.org/10.1039/d0nr04776g· OSTI ID:1771313

Epitaxial films of vanadium dioxide (VO2) on rutile TiO2 substrates provide a means of strain-engineering the transition pathways and stabilizing of the intermediate phases between monoclinic (insulating) M1 and rutile (metal) R end phases. In this work, we investigate structural behavior of epitaxial VO2 thin films deposited on isostructural MgF2 (001) and (110) substrates via temperature-dependent Raman microscopy analysis. The choice of MgF2 substrate clearly reveals how elongation of V–V dimers accompanied by the shortening of V–O bonds triggers the intermediate M2 phase in the temperature range between 70–80 °C upon the heating–cooling cycles. Consistent with earlier claims of strain-induced electron correlation enhancement destabilizing the M2 phase our temperature-dependent Raman study supports a small temperature window for this phase. The similarity of the hysteretic behavior of structural and electronic transitions suggests that the structural transitions play key roles in the switching properties of epitaxial VO2 thin films.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); US Air Force Office of Scientific Research (AFOSR); Secretaría de Educación Superior, Ciencia, Tecnología e Innovación (Senescyt)
Grant/Contract Number:
AC02-06CH11357; FA9550-18-1-0024; DMR-1719875; E0565514
OSTI ID:
1771313
Alternate ID(s):
OSTI ID: 1658636
Journal Information:
Nanoscale, Vol. 12, Issue 36; ISSN 2040-3364
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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