Correlation of oxygen vacancy and Jahn-Teller polarons in epitaxial perovskite SrMnO3 ultrathin films: Dielectric spectroscopy investigations

被引：7

作者：

Bai, Jiawei ^{[1
]}

Liu, Qingqing ^{[1
]}

Wu, Man ^{[1
]}

Yang, Jing ^{[1
]}

Jiang, Wei ^{[2
]}

Wang, Jianlu ^{[2
]}

Bai, Wei ^{[1
]}

Zhang, Yuanyuan ^{[1
]}

Tang, Xiaodong ^{[1
,3
]}

Chu, Junhao ^{[1
,2
]}

机构：

[1] East China Normal Univ, Dept Elect Sci, Minist Educ, Key Lab Polar Mat & Devices, Shanghai 200241, Peoples R China

[2] Chinese Acad Sci, Shanghai Inst Tech Phys, Natl Lab Infrared Phys, Shanghai 200083, Peoples R China

[3] Shanxi Univ, Collaborat Innovat Ctr Extreme Opt, Taiyuan 030006, Peoples R China

来源：

APPLIED PHYSICS LETTERS | 2020年 / 116卷 / 14期

关键词：

Strontium titanates - Electron-phonon interactions - Ultrathin films - Perovskite - Heterojunctions - Molecular beam epitaxy - Oxygen vacancies - Polarons - Jahn-Teller effect;

D O I：

10.1063/1.5145245

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Temperature-dependent dielectric spectroscopy was used to observe multiple dielectric responses involving four sets of dielectric relaxations (DRs) in molecular beam epitaxy-deposited ultrathin (001) SrMnO3/Nb:SrTiO3 heterojunctions. Two sets of oxygen-vacancy (OV)-related DRs, which were sensitive to oxygen annealing, were attributed to short-range OV hopping and localized Jahn-Teller (JT)-polaron hopping-induced dipolar-type relaxations. Arising from electron-phonon coupling between e(g) electrons and JT-distortion in Mn3+ ions, the appearance of JT-polarons was closely related to the presence of oxygen vacancies, which leads to transitions from Mn4+ to Mn3+.

引用

页数：5

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