The dynamical process of the phase transition from VO2(M) to VO2(R)

The dynamical process of the phase transition from VO2(M) to VO2(R)
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VO2(M)到VO2(R)相变的动力学过程

DOI:
10.1063/1.3665640
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发表时间:
2011-12
影响因子:
3.2
通讯作者:
Pan, B. C.
Pan, B. C.
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Qu, B. Y.;He, H. Y.;Pan, B. C.

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在动力学理论的框架下,研究了金属-绝缘体从VO2(M)向VO2(R)过渡的动力学过程。发现在VO2(M)晶格中,频率为212.7 cm-1的Raman-active Ag模式的热激发驱动化合物成为VO2(R)晶格。揭示了相变过程中的中间结构,发现当M相中原子网络偏离初始网络的变形超过60%时,体系变为金属。目前,晶体的单斜对称性仍然保持不变,但更多的V离子是二聚的。这有力地表明,化合物中V离子的二聚化在从M相到R相的转变中起着关键作用。
The dynamical process of the metal-insulator transition, from VO2(M) to VO2(R), is studied in the framework of the dynamics theory. It is found that the thermal exciting of the Raman-active Ag mode with frequency of 212.7 cm-1 in the VO2(M) lattice drives the compound to be the VO2(R) lattice. The intermediate structures during the phase transition are revealed, from which we find that when the distortion of the atomic network away from its initial network in the M phase exceeds 60%, the system becomes metallic. At the moment, the monoclinic symmetry of the crystal remains still, but more V ions are dimerized. This strongly suggests that the dimerization of the V ions in the compound plays a critical role in the transition from the M phase to the R phase.
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