title: Decoupling of structural and electronic phase transitions in VO2.
abstract: Using optical, TEM, and ultrafast electron diffraction experiments we find that single crystal VO(2) microbeams gently placed on insulating substrates or metal grids exhibit different behaviors, with structural and metal-insulator transitions occurring at the same temperature for insulating substrates, while for metal substrates a new monoclinic metal phase lies between the insulating monoclinic phase and the metallic rutile phase. The structural and electronic phase transitions in these experiments are strongly first order and we discuss their origins in the context of current understanding of multiorbital splitting, strong correlation effects, and structural distortions that act cooperatively in this system.
authors.affiliation: Physics and Astronomy Department, Michigan State University, East Lansing, Michigan 48824, USA.
authors.forename: Zhensheng
authors.initials: Z
authors.lastname: Tao
authors.forename: Tzong-Ru T
authors.initials: TR
authors.lastname: Han
authors.forename: Subhendra D
authors.initials: SD
authors.lastname: Mahanti
authors.forename: Phillip M
authors.initials: PM
authors.lastname: Duxbury
authors.forename: Fei
authors.initials: F
authors.lastname: Yuan
authors.forename: Chong-Yu
authors.initials: CY
authors.lastname: Ruan
authors.forename: Kevin
authors.initials: K
authors.lastname: Wang
authors.forename: Junqiao
authors.initials: J
authors.lastname: Wu