Journal
PHYSICAL REVIEW B
Volume 80, Issue 24, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.241105
Keywords
atomic force microscopy; beams (structures); elasticity; free energy; metal-insulator transition; nanostructured materials; solid-state phase transformations; vanadium compounds
Funding
- National Science Foundation [EEC-0425914]
- Lawrence Berkeley National Laboratory under the Department of Energy [DE-AC02-05CH11231]
- Focus Center Research Program on Materials, Structures, and Devices (FCRP/MSD)
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We investigated external-stress-induced metal-insulator phase transitions in cantilevered single-crystal VO2 nanobeams at variable temperatures using a combined theoretical and experimental approach. An atomic force microscope was used to measure the force-displacement curve of the nanobeams, which showed nonlinearity that signifies activation and expansion of domains of a new phase out of the old one. Superelasticity of the VO2 nanobeam and supersaturation of the phase transition were clearly observed and quantified within the general theory of first-order phase transitions. Phase field modeling was employed to understand the energetics of the domain formation.
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