Observation of Weakened V—V Dimers in the Monoclinic Metallic Phase of Strained VO 2

Emergent order at mesoscopic length scales in condensed matter can provide fundamental insight into the underlying competing interactions and their relationship with the order parameter. Using spectromicroscopy, we show that mesoscopic stripe order near the metal-insulator transition (MIT) of strain...

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Bibliographic Details
Published in:Physical review letters 2018-12, Vol.121 (25), Article 256403
Main Authors: Laverock, J., Jovic, V., Zakharov, A. A., Niu, Y. R., Kittiwatanakul, S., Westhenry, B., Lu, J. W., Wolf, S. A., Smith, K. E.
Format: Article
Language:English
Subjects:
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
electronic structure
first-principles calculations
low-energy electron microscopy
metal-insulator transition
photoelectron emission microscopy
physics
strongly correlated systems
thin films
X-ray absorption spectroscopy
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Summary:Emergent order at mesoscopic length scales in condensed matter can provide fundamental insight into the underlying competing interactions and their relationship with the order parameter. Using spectromicroscopy, we show that mesoscopic stripe order near the metal-insulator transition (MIT) of strained VO2 represents periodic modulations in both crystal symmetry and V—V dimerization. Above the MIT, we unexpectedly find the long-range order of V—V dimer strength and crystal symmetry become dissociated beyond ≈200 nm, whereas the conductivity transition proceeds homogeneously in a narrow temperature range.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.121.256403