Enhanced physical compatibility in manganite/cuprate multilayer with high-quality interface

A systematical study of the relationship between microstructure of interface and physical properties is performed on La 0.67Ca 0.33MnO 3(LCMO)/YBa 0.85Eu 0.15Cu 3O 7 (YEBCO) multilayer. Flat and chemically well-defined interface is found for the film grown on (001) oriented SrTiO 3 (STO) substrate....

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Bibliographic Details
Published in:Thin solid films 2011-09, Vol.519 (23), p.8338-8342
Main Authors: Xie, Qiyun, Qian, Bin, Wu, Xiaoshan, Zou, Jin, Gao, Ju
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
COPPER OXIDE
Crystal defects
DEFECTS
Exact sciences and technology
Ferromagnetism
Interface structure
INTERFACES
INTERLAYERS
LATTICE DEFECTS
Magnetic properties and materials
MAGNETORESISTIVITY
Magnetotransport phenomena, materials for magnetotransport
Manganite/cuprate multilayer
Manganites
MICROSTRUCTURES
Multilayers
Multilayers, superlattices , heterostructures
Nanostructure
Physics
SINGLE CRYSTALS
Superconducting films and low-dimensional structures
SUPERCONDUCTIVITY
Transmission electron microscopy (TEM)
Yttria stabilized zirconia
YTTRIUM OXIDE
Zirconium dioxide
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Summary:A systematical study of the relationship between microstructure of interface and physical properties is performed on La 0.67Ca 0.33MnO 3(LCMO)/YBa 0.85Eu 0.15Cu 3O 7 (YEBCO) multilayer. Flat and chemically well-defined interface is found for the film grown on (001) oriented SrTiO 3 (STO) substrate. High resolution transmission electron microscopy observations reveal that nano-scale periods of multilayer structure can effectively suppress the second phase inclusions that are commonly seen in superconducting single layer. The coexistence of ferromagnetism and superconducting behavior is evidenced in [(LCMO)/(YEBCO)] 6/STO multilayer. In contrast, when using Y stabilized ZrO 2 single crystals (YSZ) as substrate, pyramid-like defects and disordering layer form because of the lattice mismatch between the film and the substrate. The superconducting transition response is lost in this case but large magnetoresistance is obtained. These results indicate an extensive rearrangement of ferromagnetic domain under applied magnetic field at extended defects dominated [(LCMO)/(YEBCO)] 6/YSZ multilayer. The decoupling of ferromagnetism and superconductivity in [(LCMO)/(YEBCO)] 6/YSZ multilayer is ascribed to the missing high-quality interface nature that otherwise present in [(LCMO)/(YEBCO)] 6/STO multilayer.
ISSN:0040-6090
1879-2731
DOI:10.1016/j.tsf.2011.03.064