Search

Your search keyword '"Bauch, T."' showing total 17 results
Start Over Author "Bauch, T." Publisher iop publishing
17 results on '"Bauch, T."'

2. Electromigration tuning of the voltage modulation depth in YBa2Cu3O nanowire-based SQUIDs.

Author

Trabaldo, E, Garibaldi, A, Lombardi, F, and Bauch, T

Subjects
SUPERCONDUCTING quantum interference devices, ELECTRODIFFUSION, SQUIDS
Abstract

Oxygen electromigration applied to a YBa2Cu3O nanowire can be used to tune its electrical properties. Here, we apply electromigration to YBCO nanowire-based superconducting quantum interference devices (SQUIDs) and study its effect on the voltage modulation depth of the devices. Using a dc electromigration current we replenish the oxygen of the weak links, improving the critical current symmetry of the SQUIDs. AC current electromigration is used to reduce the doping level of the weak links, thus reducing their critical current and increasing differential resistance. Both type of electromigration processes are found to improve the SQUIDs performance, although the best results are obtained with ac biased electromigration, which improved the voltage modulations of the SQUIDs by a factor as high as 8. This procedure can be instrumental to fine tune ex-situ the properties of superconducting electronics where a large number of weak links are required. [ABSTRACT FROM AUTHOR]

Published
2021
Full Text
View/download PDF

16. Dynamics of d-wave YBa2Cu3O7−xdc SQUIDs

Author

G. Rotoli, Thilo Bauch, Francesco Tafuri, J. R. Johansson, Floriana Lombardi, Karin Cedergren, T., Bauch, K., Cedergren, J., Johansson, Rotoli, Giacomo, Tafuri, Francesco, F., Lombardi, Bauch, T., Cedergren, K., Johansson, J., Rotoli, G., and Lombardi, F.

Subjects
Josephson effect, Superconductivity, Physics, High-temperature superconductivity, Condensed matter physics, Metals and Alloys, Condensed Matter Physics, STATE, law.invention, Magnetic field, Pi Josephson junction, SQUID, Inductance, JOSEPHSON-JUNCTION, SUPERCONDUCTORS, law, Condensed Matter::Superconductivity, Materials Chemistry, Ceramics and Composites, Electrical and Electronic Engineering, QUANTUM DYNAMICS, Type-II superconductor
Abstract

The predominant d-wave pairing symmetry in high temperature superconductors leads to an unconventional current - phase relation in Josephson junctions. This circumstance may induce new effects in the dynamics of dc SQUIDs. In this contribution we report on the measurements of the dependence of the SQUID Josephson current on the external magnetic field taken at very low temperatures, down to 20 mK. Different grain boundaries have been fabricated by using the biepitaxial and the bicrystal technique. Some of the effects which are induced by a nonsinusoidal current - phase relation can be clearly identified in the dynamics of the SQUIDs. The experimental data are also compared with theoretical simulations taking into account the inductance of the loop. The data show that, in specific conditions, a non-negligible inductance of the loop can induce effects similar to an unconventional current - phase relation, with a pronounced second harmonic sin( 2 phi) term. This fact has to be taken into account when designing d- wave SQUIDs for quantum circuitry.

Published
2007

17. Fabrication and properties of sub-micrometric YBCO biepitaxial junctions

Author

Karin Cedergren, Floriana Lombardi, D. Stornaiuolo, G. Rotoli, Thilo Bauch, Antonio Barone, Francesco Tafuri, D. Born, Stornaiuolo, Daniela, K., Cedergren, G., Rotoli, D., Born, T., Bauch, Barone, Antonio, Lombardi, Filomena, Tafuri, Francesco, Stornaiuolo, D, Cedergren, K, Rotoli, Giacomo, Born, D, Bauch, T, Barone, A, and Lombardi, F

Subjects
Superconductivity, Josephson effect, High-Tc film, History, Fabrication, Materials science, Y-based cuprate, Nanotechnology, Grain and twin boundaries, Epitaxy, Engineering physics, Computer Science Applications, Education, Faceting, Grain boundary, Cuprate, Type-II superconductor
Abstract

We report on the fabrication procedure and the transport properties of submicron grain boundary biepitaxial YBCO Josephson junctions. These first results are very encouraging and justify further expectations on improved performances for such types of devices. A reduced and more controlled faceting along the grain boundary interface, for instance, will better preserve intrinsic d-wave effects, and favour the study of fluxons dynamics.

Published
2009

Catalog

Books, media, physical & digital resources
See catalog results