A near-field study of VO2/(100)TiO2 film and its crack-induced strain relief

被引：2

作者：

Chen, Xinzhong ^{[1
]}

Kittiwatanakul, Salinporn ^{[2
,3
]}

Cheng, Yinke ^{[1
]}

Slusar, Tetiana V. ^{[4
]}

Mcleod, Alexander S. ^{[5
]}

Li, Zhuoqi ^{[1
]}

Kim, Hyun-Tak ^{[4
]}

Basov, D. N. ^{[5
]}

Liu, Mengkun ^{[1
,6
]}

机构：

[1] SUNY Stony Brook, Dept Phys & Astron, Stony Brook, NY 11794 USA

[2] Univ Virginia, Dept Mat Sci & Engn, Charlottesville, VA 22904 USA

[3] Chulalongkorn Univ, Dept Phys, Fac Sci, Bangkok 10330, Thailand

[4] ETRI, Met Insulator Transit Creat Res Ctr, Daejeon 305350, South Korea

[5] Columbia Univ, Dept Phys, New York, NY 92093 USA

[6] Brookhaven Natl Lab, Natl Synchrotron Light Source 2, Upton, NY 11973 USA

来源：

APPLIED PHYSICS LETTERS | 2022年 / 121卷 / 02期

关键词：

Free energy - Metal insulator boundaries - Oxide films - Semiconductor insulator boundaries - Thin films - Titanium dioxide - Vanadium dioxide;

D O I：

10.1063/5.0099142

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Temperature-induced metal-insulator transition (MIT) in vanadium dioxide (VO2) has been under intense research interest for decades both theoretically and experimentally. Due to the complex nature of electron correlations, the underlying physics behind the MIT in VO2 has yet to be fully grasped. In this work, we utilize the fine resolution of the scattering-type scanning near-field optical microscope to investigate the MIT in an epitaxial VO2 thin film on the (100)(R) TiO2 substrate with mid-infrared light. Bidirectional tweed-like metal-insulator phase coexistence patterns are observed and understood under the Landau free energy paradigm. More interestingly, delayed metallic nucleation is observed near the surface cracks due to local strain relief. This research proposes ideas in investigating the temperature-pressure phase diagram and tuning the interplay between local strain and MIT in oxide thin films.

引用

页数：5

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