Understanding the Nature of the Kinetic Process in a VO2 Metal-Insulator Transition

被引：193

作者：

Yao, Tao ^{[2
]}

Zhang, Xiaodong ^{[1
]}

Sun, Zhihu ^{[2
]}

Liu, Shoujie ^{[2
]}

Huang, Yuanyuan ^{[2
]}

Xie, Yi ^{[1
]}

Wu, Changzheng ^{[1
]}

Yuan, Xun ^{[3
]}

Zhang, Wenqing ^{[3
]}

Wu, Ziyu ^{[2
]}

Pan, Guoqiang ^{[2
]}

Hu, Fengchun ^{[2
]}

Wu, Lihui ^{[2
]}

Liu, Qinghua ^{[2
]}

Wei, Shiqiang ^{[2
]}

机构：

[1] Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Dept Nanomat & Nanochem, Hefei 230026, Peoples R China

[2] Univ Sci & Technol China, Natl Synchrotron Radiat Lab, Hefei 230029, Anhui, Peoples R China

[3] Chinese Acad Sci, Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine, Shanghai 200050, Peoples R China

来源：

PHYSICAL REVIEW LETTERS | 2010年 / 105卷 / 22期

基金：

中国国家自然科学基金;

关键词：

SPECTROSCOPY;

D O I：

10.1103/PhysRevLett.105.226405

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Understanding the kinetics during the metal-insulator transition process is crucial to sort out the underlying physical nature of electron-lattice interactions in correlated materials. Here, based on the temperature-dependent in situ x-ray absorption fine structure measurement and density-functional theory calculations, we have revealed that the monoclinic-to-tetragonal phase transition of VO2 near the critical temperature is characterized by a sharp decrease of the twisting angle delta of the nearest V-V coordination. The VO2 metallization occurs in the intermediate monocliniclike structure with a large twist of V-V pairs when the delta angle is smaller than 1.4 degrees. The correlation between structural kinetics and electronic structure points out that the structural rearrangement is a key factor to narrow the insulating band gap.

引用

页数：4

共 22 条

[1] Evidence of a pressure-induced metallization process in monoclinic VO2 [J].