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American Chemical Society, Nano Letters, 12(10), p. 4824-4829, 2010

DOI: 10.1021/nl103311a

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Soft nanostructuring of YBCO Josephson Junctions by phase separation

Journal article published in 2010 by David Gustafsson, Henrik Pettersson, Beniamino Iandolo, Eva Olsson ORCID, Thilo Bauch, Floriana Lombardi
This paper is available in a repository.
This paper is available in a repository.

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Abstract

We have developed a new method to fabricate biepitaxial YBa2Cu3O(7-x) (YBCO) Josephson junctions at the nanoscale, allowing junctions widths down to 100 nm and simultaneously avoiding the typical damage in grain boundary interfaces due to conventional patterning procedures. By using the competition between the superconducting YBCO and the insulating Y2BaCuO5 phases during film growth, we formed nanometer sized grain boundary junctions in the insulating Y2BaCuO5 matrix as confirmed by high resolution transmission electron microscopy. Electrical transport measurements give clear indications that we are close to probing the intrinsic properties of the grain boundaries. ; Comment: 16 pages, 6 figures