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Journal Article
Monoclinic and Correlated Metal Phase in VO 2 as Evidence of the Mott Transition : Coherent Phonon Analysis
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- Authors
- Hyun-Tak Kim, Yong Wook Lee, Bong-Jun Kim, Byung-Gyu Chae, Sun Jin Yun, Kwang-Yong Kang, Jeon Han Kang, Ki-Ju Yee, Yong-Sik Lim
- Issue Date
- 2006-12
- Citation
- Physical Review Letters, v.97, no.26, pp.1-4
- ISSN
- 0031-9007
- Publisher
- American Physical Society(APS)
- Language
- English
- Type
- Journal Article
- Abstract
- In femtosecond pump-probe measurements, the appearance of coherent phonon oscillations at 4.5 and 6.0A THz indicating the rutile metal phase of VO2 does not occur simultaneously with the first-order metal-insulator transition (MIT) near 68°C. The monoclinic and correlated metal (MCM) phase between the MIT and the structural phase transition (SPT) is generated by a photoassisted hole excitation, which is evidence of the Mott transition. The SPT between the MCM phase and the rutile metal phase occurs due to subsequent Joule heating. The MCM phase can be regarded as an intermediate nonequilibrium state. © 2006 The American Physical Society.
- KSP Keywords
- Coherent phonon, Femtosecond pump-probe, Joule Heating, Metal phase, Mott transition, Nonequilibrium state, VO 2, correlated metal, first-order, metal-insulator transition, pump-probe measurements