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arXiv 1006.0958cond-mat.mtrl-scicond-mat.str-el
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VO2金属-绝缘体转变结构变化的实空间研究

Real space investigation of structural changes at the metal-insulator transition in VO2

Serena A. Corr, Daniel P. Shoemaker, Brent C. Melot, Ram Seshadri

摘要:

同步辐射X射线全散射研究的结构变化在金红石VO 2的金属-绝缘体转变温度为340 K显示,单斜和四斜相的VO 2共存平衡,预期的一阶相变。没有发现任何明显的中间相。无偏的本地结构的研究,通过相变中的V-V距离的变化,使用反向蒙特卡罗方法,支持相共存的想法,并指出在二聚化的低温结构的高度相关性。没有证据表明短程V-V的相关性,这将是暗示本地二聚体被发现在金属相。

英文摘要:

Synchrotron X-ray total scattering studies of structural changes in rutile VO2 at the metal-insulator transition temperature of 340 K reveal that monoclinic and tetragonal phases of VO2 coexist in equilibrium, as expected for a first-order phase transition. No evidence for any distinct intermediate phase is seen. Unbiased local structure studies of the changes in V--V distances through the phase transition, using reverse Monte Carlo methods, support the idea of phase coexistence and point to the high degree of correlation in the dimerized low-temperature structure. No evidence for short range V--V correlations that would be suggestive of local dimers is found in the metallic phase.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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