Correlation-Driven Insulator-Metal Transition in Near-Ideal Vanadium Dioxide Films
Permanent link to this recordhttp://hdl.handle.net/20.500.12613/5726
MetadataShow full item record
Abstract© 2016 American Physical Society. We use polarization- and temperature-dependent x-ray absorption spectroscopy, in combination with photoelectron microscopy, x-ray diffraction, and electronic transport measurements, to study the driving force behind the insulator-metal transition in VO2. We show that both the collapse of the insulating gap and the concomitant change in crystal symmetry in homogeneously strained single-crystalline VO2 films are preceded by the purely electronic softening of Coulomb correlations within V-V singlet dimers. This process starts 7 K (±0.3 K) below the transition temperature, as conventionally defined by electronic transport and x-ray diffraction measurements, and sets the energy scale for driving the near-room-temperature insulator-metal transition in this technologically promising material.
Citation to related workAmerican Physical Society (APS)
Has partPhysical Review Letters
ADA complianceFor Americans with Disabilities Act (ADA) accommodation, including help with reading this content, please contact firstname.lastname@example.org