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Smooth surfaces in very thin GdBa2Cu3O7 - δ films for application in superconducting tunnel junctions

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Title
Smooth surfaces in very thin GdBa2Cu3O7 - δ films for application in superconducting tunnel junctions
Author(s)
Navarro H.; Sirena M.; Jeehoon Kim; Haberkorn N.
Publication Date
2015-03
Journal
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, v.510, no., pp.21 - 26
Publisher
ELSEVIER SCIENCE BV
Abstract
This paper provides a systematic analysis of the morphology and the superconducting critical temperature obtained in very thin GdBa2Cu3O7d films grown on (001) SrTiO3 substrates by DC sputtering. We find that the use of a very thin SrTiO3 buffer layer (2 nm) modify the nucleation of GdBa2Cu3O7d on the surface of the substrate reducing the formation of 3 dimensional clusters. Our results demonstrate that 16 nm thick GdBa2Cu3O7d films with an average root-mean-square (RMS) smaller than 1 nm and large surface areas (up 10 lm2) free of 3 dimensional topological defects can be obtained. In films thinner than 24 nm the onset (zero resistance) of superconducting transition of the films is reduced, being close to liquid nitrogen. This fact can be associated with stress reducing the orthorhombicity and slightly drop in oxygen stoichiometry.
URI
https://pr.ibs.re.kr/handle/8788114/1682
ISSN
0921-4534
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > Journal Papers (저널논문)
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