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Chin. Phys. B, 2019, Vol. 28(4): 046101    DOI: 10.1088/1674-1056/28/4/046101
CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES Prev   Next  

Off-axis electron holography of manganite-based heterojunctions: Interface potential and charge distribution

Zhi-Bin Ling(令志斌), Gui-Ju Liu(刘桂菊), Cheng-Peng Yang(杨成鹏), Wen-Shuang Liang(梁文双), Yi-Qian Wang(王乙潜)
College of Physics & State Key Laboratory, Qingdao University, Qingdao 266071, China
Abstract  

The interfacial electrical potentials and charge distributions of two manganite-based heterojunctions, i.e., La0.67Ca0.33MnO3/SrTiO3:0.05 wt% Nb (LCMO/STON) and La0.67Ca0.33MnO3/LaMnO3/SrTiO3:0.05 wt% Nb (simplified as LCMO/LMO/STON), are studied by means of off-axis electron holography in a transmission electron microscope. The influences of buffer layer on the microstructure and magnetic properties of the LCMO films are explored. The results show that when a buffer layer of LaMnO3 is introduced, the tensile strain between the STON substrate and LCMO film reduces, misfit dislocation density decreases near the interfaces of the heterojunctions, and a positive magnetoresistance is observed. For the LCMO/STON junction, positive and negative charges accumulate near the interface between the substrate and the film. For the LCMO/LMO/STON junction, a complex charge distribution takes place across the interface, where notable negative charges accumulate. The difference between the charge distributions near the interface may shed light on the observed generation of positive magnetoresistance in the junction with a buffer layer.

Keywords:  La0.67Ca0.33MnO3 films      electron holography      magnetic properties      interfacial electrical potential      charge distribution     
Received:  11 January 2019      Published:  05 April 2019
PACS:  61.05.jp (Electron holography)  
  68.37.-d (Microscopy of surfaces, interfaces, and thin films)  
  68.37.Og (High-resolution transmission electron microscopy (HRTEM))  
  75.70.Cn (Magnetic properties of interfaces (multilayers, superlattices, heterostructures))  
Corresponding Authors:  Yi-Qian Wang     E-mail:  yqwang@qdu.edu.cn

Cite this article: 

Zhi-Bin Ling(令志斌), Gui-Ju Liu(刘桂菊), Cheng-Peng Yang(杨成鹏), Wen-Shuang Liang(梁文双), Yi-Qian Wang(王乙潜) Off-axis electron holography of manganite-based heterojunctions: Interface potential and charge distribution 2019 Chin. Phys. B 28 046101

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