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학술지 Monoclinic and Correlated Metal Phase in VO 2 as Evidence of the Mott Transition : Coherent Phonon Analysis
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저자
김현탁, 이용욱, 김봉준, 채병규, 윤선진, 강광용, 강전한, 이기주, 임용식
발행일
200612
출처
Physical Review Letters, v.97 no.26, pp.1-4
ISSN
0031-9007
출판사
American Physical Society(APS)
DOI
https://dx.doi.org/10.1103/PhysRevLett.97.266401
초록
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 제안 키워드
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