Optically-induced effects in Y-Ba-Cu-O Josephson junctions

Autor(en)

R. Adam, R. Sobolewski, W. Markowitsch, C. Stockinger, W. Lang

Abstrakt

We report our studies on light-induced changes in electrical properties of YBa/sub 2/Cu/sub 3/O/sub x/ (YBCO) grain-boundary Josephson weak links. We discuss the erasable process (photodoping), in which light-induced enhancement of junctions properties at low temperatures relaxes back above 250 K. Our studies are focused on the junction critical current versus time, light intensity, and magnetic field measurements. In tested few- mu m-wide step-edge junctions, photodoping manifested itself as above 50% increase of the critical current and the decrease of the junction magnetic penetration depth, leading to reduction of the effective junction width. Contrary to the photodoping effect, the high-intensity laser modification of junctions led to permanent modification of their electrical characteristics that remained unchanged after subsequent room-temperature/helium thermal cycling of the sample. The laser-modified junctions exhibited up to 25% increase of the critical current times normal-state resistance product.

Organisation(en)

Elektronische Materialeigenschaften

Journal

Applied Superconductivity

Band

6

Seiten

759-765

Anzahl der Seiten

7

ISSN

0964-1807

DOI

https://doi.org/10.1016/S0964-1807(99)00039-3

Publikationsdatum

1998

Peer-reviewed

Ja

ÖFOS 2012

103018 Materialphysik

Schlagwörter

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/a566357d-91c7-407c-9afa-6b9278c9f8cf