Macroscopic quantum tunneling and retrapping processes in moderately damped YBaCuO Josephson junctions

• Published in: Физика низких температур
• Date: 2013
• Main Authors: Massarotti, D., Longobardi, L., Galletti, L., Stornaiuolo, D., Rotoli, G., Tafuri, F.
• Format: Article
• Language: English
• Published: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2013
• Subjects: К 75-летию со дня рождения И. К. Янсона
• Online Access: https://nasplib.isofts.kiev.ua/handle/123456789/118248
• Journal Title: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Cite this: Macroscopic quantum tunneling and retrapping
 processes in moderately damped YBaCuO
 Josephson junctions / D. Massarotti, L. Longobardi, L. Galletti, D. Stornaiuolo,
 G. Rotoli, F. Tafuri // Физика низких температур. — 2013. — Т. 39, № 3. — С. 378–383. — Бібліогр.: 37 назв. — англ.

The moderately damped regime in a Josephson junction (JJ) is quite common in devices characterized by low
 critical currents and therefore by low Josephson energies. Measurements of switching current distribution (SCD)
 are a direct way of discriminating the phase dynamics also in the nontrivial case of moderate damping, which is
 going to be more and more common with advances in nanopatterning superconductors and in materials science
 finalized to build hybrid systems. We report on measurements of SCDs, both in thermal and quantum regime, on
 moderately damped YBaCuO grain boundary biepitaxial JJs. A direct transition from phase diffusion regime to
 macroscopic quantum tunnelling occurs at about 130 mK. The crossover to the quantum regime is tuned by the
 magnetic field and phase dynamics is described by a fully consistent set of junction parameters derived through
 numerical simulations.