Epitaxial growth and transport properties of compressively-strained Ba2IrO4 films

• 作者: Yun-Qi Zhao Heng Zhang Xiang-Bin Cai Wei Guo Dian-Xiang Ji Ting-Ting Zhang Zheng-Bin Gu Jian Zhou Ye Zhu Yue-Feng Nie
• 来源期刊: 中国物理B（英文版）
• 年，卷（期）: 2021,（8）
• 所属期刊栏目: CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES
• 页码范围: 561-565
• 页数: 5页
• 语种: 英文
• DOI: 10.1088/1674-1056/abea97

摘要

Ba2IrO4 is a sister compound of the widely investigated Sr2IrO4 and has no IrO6 octahedral rotation nor net canted antiferromagnetic moment,thus it acts as a system more similar to the high-Tc cuprate.In this work,we synthesize the Ba2IrO4 epitaxial films by reactive molecular beam epitaxy and study their crystalline structure and transport properties under biaxial compressive strain.High resolution scanning transmission electron microscopy and x-ray diffraction confirm the high quality of films with partial strain relaxation.Under compressive epitaxial strain,the Ba2IrO4 exhibits the strain-driven enhancement of the conductivity,consistent with the band gap narrowing and the stronger hybridization of Ir-t2g and O-2p orbitals predicted in the first-principles calculations.