Advances in high-Tc grain boundary junctions

• Date: 2004
• Main Authors: Tafuri, F., Kirtley, J.R., Lombardi, F., Medaglia, P.G., Orgiani, P., Balestrino, G.
• Format: Article
• Language: English
• Published: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2004
• Subjects: Сверхпроводимость и мезоскопические структуры
• Online Access: https://nasplib.isofts.kiev.ua/handle/123456789/119833
• Journal Title: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Cite this: Advances in high-Tc grain boundary junctions / F. Tafuri, J.R. Kirtley, F. Lombardi, P.G. Medaglia, P. Orgiani, G. Balestrino // Физика низких температур. — 2004. — Т. 30, № 7-8. — С. 785-794. — Бібліогр.: 44 назв. — англ.

We review results on two novel types of grain boundary Josephson junctions in the high critical
 temperature cuprate superconductors. The quality of YBa₂Cu₃O₇-δ biepitaxial grain boundary
 Josephson junctions have been improved using a new growth geometry to the point that «tunnel-
 like» characteristics are reproducibly obtained. The consequent low barrier transmission probabilities
 are apparently favourable to isolate intrinsic d-wave induced effects. We also focus on peculiar
 aspects of spontaneous currents in HTS Josephson junctions, which are unique and reflect
 the intimate relation between vortex matter and the Josephson effect. Bicrystal grain boundary
 Josephson junctions have also been fabricated using artificial superlattice films with as few as six
 superconducting copper–oxygen planes. Extrinsic and intrinsic d-wave effects in these junctions
 are discussed within the framework of novel designs for π-circuitry and qubits.