Publication
Title
$YBa_{2}Cu_{3}O_{7-x}$ Josephson junctions and dc SQUIDs based on $45^{\text{\textdegree}}$ a-axis tilt and twist grain boundaries : atomically clean interfaces for applications
Author
Abstract
 YBa2Cu3O7-x artificial grain boundary Josephson junctions have been fabricated, employing a recently implemented biepitaxial technique. The grain boundaries can be obtained by controlling the orientation of the MgO seed layer and are characterized by a misalignment of the c-axes (45 degrees a-axis tilt or 45 degrees a-axis twist). These types of grain boundaries are still mostly unexplored. We carried out a complete characterization of their transport properties and microstructure. Junctions and de SQUIDs associated with these grain boundaries exhibit an excellent Josephson phenomenology and high values of the ICRN product and of the magnetic flux-to-voltage transfer parameter respectively. Remarkable differences in the transport parameters of tilt and twist junctions have been observed, which can be of interest for several applications. A maximum speed of Josephson vortices as calculated from the voltage step values of the order of 2 x 10(6) m s(-1) is obtained. These devices could also have some impact on experiments designed to study the symmetry of the order parameter, exploiting their microstructure and anisotropic properties. High-resolution electron microscopy showed the presence of perfect basal plane faced boundaries in the cross sections of tilt boundaries.
Language
English
Source (journal)
Superconductor science and technology. - Bristol
Source (book)
International Superconductive Electronics Conference, JUN 21-25, 1999, BERKELEY, CALIFORNIA
Publication
Bristol : 1999
ISSN
0953-2048
Volume/pages
12:11(1999), p. 1007-1009
ISI
000083948400093
Full text (Publisher's DOI)
Full text (publisher's version - intranet only)
UAntwerpen
 Faculty/Department Research group Publication type Subject Affiliation Publications with a UAntwerp address