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Electrical and structural properties of VO2 in an electric field

Journal Article · · Current Applied Physics
 [1];  [2];  [2];  [3];  [3];  [2]
  1. Jeonbuk National Univ., Jeonju (South Korea); Argonne National Lab. (ANL), Argonne, IL (United States)
  2. Jeonbuk National Univ., Jeonju (South Korea)
  3. Argonne National Lab. (ANL), Argonne, IL (United States)

We examined the electrical and local structural properties of a VO2 film at different electric fields using electrical resistance and x-ray absorption fine structure (XAFS) measurements at the V K edge in the temperature range of 30–100 °C. The Tc value of the metal-to-insulator transition (MIT) during both heating and cooling decreases with electric field. When the electric field exceeds a certain value, the MIT becomes sharper due to Joule heating. Furthermore, the MIT, the structural phase transition (SPT), and the pre-edge peak transition of the VO2 do not congruently occur at a uniform temperature. A metallic VO2 is observed in only the rutile (or M2) symmetry. An electric field induces a substantial amount of conduction electrons in insulating VO2. Simultaneously measured resistance and XAFS reveal that Joule heating caused by an external electric field significantly affects the MIT and SPT of VO2.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1831185
Journal Information:
Current Applied Physics, Journal Name: Current Applied Physics Vol. 30; ISSN 1567-1739
Publisher:
Korean Physical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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