期刊
NANO LETTERS
卷 20, 期 2, 页码 1131-1140出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.9b04506
关键词
uniaxial strain engineering; manganite thin films; phase separation; scanning transmission electron microscopy; density functional theory calculations
类别
资金
- National Basic Research Program of China [2016YFA0401003, 2017YFA0403502]
- National Natural Science Foundation of China [11974326, 11804342, 51872278, 11574281]
- Hefei Science Center of Chinese Academy of Sciences [2018ZYFX002]
- China Postdoctoral Science Foundation [2018M632557]
- Anhui Province Key Laboratory of Condensed Matter Physics at Extreme conditions
- Hundred Talent Program from Chinese Academy of Sciences
- U.S. Department of Energy (DOE) [DE-SC0012375]
- National Science Foundation [ACI-1548562]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
Strongly correlated perovskite oxides exhibit a plethera of intriguing phenomena and stimulate a great potential for multifunctional device applications. Utilizing tunable uniaxial strain, rather than biaxial or anisotropic strain, delivered from the crystallography of a single crystal substrate to modify the ground state of strongly correlated perovskite oxides has rarely been addressed for phase-space control. Here, we show that the physical properties of La2/3Ca1/3MnO3 (LCMO) films are remarkably different depending on the crystallographic orientations of the orthorhombic NdGaO3 (NGO) substrates. More importantly, the antiferromagnetic charge-ordered insulating (COI) phase induced in the (100) or (001)-oriented LCMO films can be dramatically promoted (or suppressed) by a uniaxial tensile (or compressive) bending stress along the in-plane [010] direction. By contrast, the COI phase is nearly unaffected along the other transverse in-plane directions. Results from scanning transmission electron microscopy reveal that the (100)- or (001)-oriented LCMO films are uniaxially tensile strained along the [010] direction, while the LCMO/NGO(010) and LCMO/NGO(110) films remaining as a bulklike ferromagnetic metallic state exhibit a different strain state. Density functional theory calculations further reveal that the cooperatively increased Jahn-Teller distortion and charge ordering may be indispensible for the inducing and promoting of the COI phase. These findings provide a path to understand the correlation between local and extended structural distortions imparted by coherent epitaxy and the electronic states for quantum phase engineering.
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