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VO₂中作为莫特转变证据的单斜晶系和相关金属相：相干声子分析

Monoclinic and correlated metal phase in VO(2) as evidence of the Mott transition: coherent phonon analysis.

作者信息

Kim Hyun-Tak, Lee Yong Wook, Kim Bong-Jun, Chae Byung-Gyu, Yun Sun Jin, Kang Kwang-Yong, Han Kang-Jeon, Yee Ki-Ju, Lim Yong-Sik

机构信息

IT Convergence and Components Research Laboratory, ETRI, Daejeon 305-350, Republic of Korea.

出版信息

Phys Rev Lett. 2006 Dec 31;97(26):266401. doi: 10.1103/PhysRevLett.97.266401. Epub 2006 Dec 26.

DOI:10.1103/PhysRevLett.97.266401
PMID:17280436
Abstract

In femtosecond pump-probe measurements, the appearance of coherent phonon oscillations at 4.5 and 6.0 THz indicating the rutile metal phase of VO2 does not occur simultaneously with the first-order metal-insulator transition (MIT) near 68 degrees 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.

摘要

在飞秒泵浦-探测测量中，表明VO2金红石金属相的4.5和6.0太赫兹相干声子振荡的出现，与接近68摄氏度时的一级金属-绝缘体转变（MIT）并非同时发生。MIT和结构相变（SPT）之间的单斜和相关金属（MCM）相是由光辅助空穴激发产生的，这是莫特转变的证据。MCM相和金红石金属相之间的SPT是由于随后的焦耳热而发生的。MCM相可被视为一种中间非平衡态。

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