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Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model
Published on: May 23, 2018
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Imaging metal-like monoclinic phase stabilized by surface coordination effect in vanadium dioxide nanobeam
Zejun Li1, Jiajing Wu1, Zhenpeng Hu2
1Hefei National Laboratory for Physical Sciences at the Microscale, CAS Center for Excellence in Nanoscience, and CAS Key Laboratory of Mechanical Behavior and Design of Materials, University of Science and Technology of China, Hefei, Anhui 230026, China.
Nature Communications
|June 15, 2017
Summary
Researchers stabilized and imaged a predicted intermediate state in vanadium dioxide
Area of Science:
- Materials Science
- Condensed Matter Physics
- Chemistry
Background:
- Intermediate states in correlated systems appear transiently during phase transitions.
- Understanding these states is crucial for their correlated behavior.
- Directly imaging these states remains a challenge.
Purpose of the Study:
- To stabilize and image an intermediate state in the metal-insulator transition of vanadium dioxide.
- To investigate the role of surface coordination in stabilizing this state.
- To elucidate the mechanism behind the metal-insulator transition.
Main Methods:
- Surface coordination route using L-ascorbic acid.
- Direct imaging of the intermediate state.
- Analysis of charge-carrier density reorganization and orbital-selective Mott correlation.
Main Results:
- Successfully stabilized and imaged an unusual metal-like monoclinic phase of vanadium dioxide at room temperature.
- Demonstrated that coordinate bonding of L-ascorbic acid induces charge-carrier density reorganization.
- Unravelled orbital-selective Mott correlation as the mechanism for gap opening.
Conclusions:
- Coordination chemistry can stabilize and engineer properties of correlated solids.
- The study completes phase-evolution pathways in metal-insulator transitions.
- This approach offers a powerful tool for designing novel materials.
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