Uniform structural phase transition in V2O3 without short-range distortions of the local structure

被引：4

作者：

Fletcher, Ethan R. A. ^{[1
]}

Higashi, Kentaro ^{[2
]}

Kalcheim, Yoav ^{[3
]}

Kageyama, Hiroshi ^{[2
]}

Frandsen, Benjamin A. ^{[1
]}

机构：

[1] Brigham Young Univ, Dept Phys & Astron, Provo, UT 84602 USA

[2] Kyoto Univ, Grad Sch Engn, Dept Energy & Hydrocarbon Chem, Nishikyo Ku, Kyoto 6158510, Japan

[3] Technion Israel Inst Technol, Dept Mat Sci & Engn, IL-32000 Haifa, Israel

来源：

PHYSICAL REVIEW B | 2021年 / 104卷 / 18期

基金：

以色列科学基金会;

关键词：

METAL-INSULATOR-TRANSITION; MAGNETIC-STRUCTURE; SPIN; PHYSICS; SYSTEM; ORDER; STATE; PURE;

D O I：

10.1103/PhysRevB.104.184115

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The local structure of V2O3, 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 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.

引用

页数：7

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