Tuning the magnetic and transport properties of La0.8Ca0.2MnO3 films by Ba0.8Sr0.2TiO3 intercalated layers grown with polymer-assisted deposition

• Published in: Applied physics letters 2017-06, Vol.110 (23)
• Main Authors: Pan, S. Y., Shi, L., Zhao, J. Y., Xie, C. Z., Zhou, S. M., Li, Y.
• Format: Article
• Language: English
• Subjects: Annealing; Applied physics; Crystallization; Deposition; Epitaxial growth; Insulators; Magnetic properties; Metal-insulator transition; Organic chemistry; Oxide coatings; Physical properties; Polymers; Strontium titanates; Substrates; Transition metal oxides; Transport properties; Tuning; X-ray diffraction
• ISSN: 0003-6951; 1077-3118
• DOI: 10.1063/1.4984902

The La0.8Ca0.2MnO3/Ba0.8Sr0.2TiO3 (LCM/BST) bilayer films were epitaxially grown on SrTiO3 substrates with different orientations by the polymer-assisted deposition. The effects of annealing atmosphere and substrate orientation on the magnetic and transport properties of LCM/BST bilayer films have been investigated. A well crystallization quality of the films is confirmed by X-ray diffraction. Besides, the resistivity of the LCM/BST bilayer film shows high substrate-orientation dependent metal-insulator transition (MIT). However, with the decrease in temperature, in addition to the MIT at ∼220 K, an additional MIT emerges at a lower temperature and becomes robust, especially for the (111)-oriented LCM/BST bilayer film. Moreover, the additional MIT still exists when annealed in O2/air atmosphere but disappears in O2 atmosphere. Corroborated by the magnetic properties, it shows that the intercalated-layer technique of tuning the physical properties of transition-metal oxide films is achievable and more variable compared to the conventional way of chemical modification, which is beneficial to the development of multifunctional devices.