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김지훈
원자제어 저차원 전자계 연구단
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Characterization of the insulator barrier and the superconducting transition temperature in GdBa2Cu3O72d/BaTiO3 bilayers for application in tunnel junctions

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Title
Characterization of the insulator barrier and the superconducting transition temperature in GdBa2Cu3O72d/BaTiO3 bilayers for application in tunnel junctions
Author(s)
Navarro H.; Yang I.; Sirena M.; Jeehoon Kim; Haberkorn N.
Publication Date
2015-07
Journal
JOURNAL OF APPLIED PHYSICS, v.118, no.4, pp.045308 -
Publisher
AMER INST PHYSICS
Abstract
The optimization of the superconducting properties in a bottom electrode and the quality of an insulator barrier are the first steps in the development of superconductor/insulator/superconductor tunnel junctions. Here, we study the quality of a BaTiO3 tunnel barrier deposited on a 16 nm thick GdBa2Cu3O7d thin film by using conductive atomic force microscopy. We find that the tunnel current is systematically reduced (for equal applied voltage) by increasing the BaTiO3 barrier thickness between 1.6 and 4 nm. The BaTiO3 layers present an energy barrier of 1.2 eV and an attenuation length of 0.35.0.5 nm (depending on the applied voltage). The GdBa2Cu3O7d electrode is totally covered by a BaTiO3 thickness above 3 nm. The presence of ferroelectricity was verified by piezoresponse force microscopy for a 4 nm thick BaTiO3 top layer. The superconducting transition temperature of the bilayers is systematically suppressed by increasing the BaTiO3 thickness. This fact can be associated with stress at the interface and a reduction of the orthorhombicity of the GdBa2Cu3O7d. The reduction in the orthorhombicity is expected by considering the interface mismatch and it can also be affected by reduced oxygen stoichiometry (poor oxygen diffusion across the BaTiO3 barrier). © 2015 AIP Publishing LLC
URI
http://pr.ibs.re.kr/handle/8788114/1984
DOI
10.1063/1.4927751
ISSN
0021-8979
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > Journal Papers (저널논문)
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