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arXiv 2109.04436cond-mat.str-el
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V $_2$ O $_3$的均匀结构相变

Uniform structural phase transition in V$_2$O$_3$ without short-range distortions of the local structure

Ethan R. A. Fletcher, Kentaro Higashi, Yoav Kalcheim, Hiroshi Kageyama, Benjamin A. Frandsen

摘要:

通过对中子和X射线全散射数据的对分布函数(PDF)分析,研究了典型的强关联电子系统V $_{2}$ O $_{3}$的局域结构.菱形到单斜结构的相变表现为在所观察到的PDF的所有长度尺度上的突变。在150 K和160 K之间,虽然观察到相分离的菱面体和单斜对称共存的区域,但在过渡区上方没有发现局部结构的单斜畸变。这种缺乏结构波动以上的过渡与已知的存在下的高温状态下的磁波动,这表明晶格自由度的过渡机制中发挥了次要作用的自旋自由度。

英文摘要:

The local structure of V$_{2}$O$_{3}$, an archetypal strongly correlated electron system that displays a metal-insulator transition around 160 K, has been investigated via pair distribution function (PDF) analysis of neutron and x-ray total scattering data. The rhombohedral-to-monoclinic structural phase transition manifests as an abrupt change on all length scales in the observed PDF. No monoclinic distortions of the local structure are found above the transition, although coexisting regions of phase-separated rhombohedral and monoclinic symmetry are observed between 150 K and 160 K. This lack of structural fluctuations above the transition contrasts with the known presence of magnetic fluctuations in the high-temperature state, suggesting that the lattice degree of freedom plays a secondary role behind the spin degree of freedom in the transition mechanism.

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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