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- Title
Manifestation of Geometric Effects in Temperature Behavior of AC Magnetic Response of Josephson Junction Arrays.
- Authors
Sergeenkov, S.; Araujo-Moreira, F. M.
- Abstract
By improving the resolution of a homemade mutual-inductance measurement technique, a pronounced steplike structure (with the number of steps n = 4 for all ac fields) has been observed in the temperature dependence of ac susceptibility in artificially prepared two-dimensional Josephson junction arrays (2D-JJA) of unshunted Nb–AlOx–Nb junctions with βL(4.2K) = 30. Using a single-plaquette approximation of the overdamped 2D-JJA model, we were able to successfully fit our data assuming that the steps are related to the geometric properties of the plaquette. The number of steps n corresponds to the number of flux quanta that can be screened by the maximum critical current of the junctions. The steps are predicted to manifest themselves in arrays with the inductance-related parameter βL(T) matching a “quantization” condition βL(0) = 2π(n+1). © 2004 MAIK “Nauka / Interperiodica”.
- Subjects
JOSEPHSON junctions; SUPERCONDUCTORS; JOSEPHSON effect; QUANTUM tunneling; ELECTRIC inductance; TEMPERATURE
- Publication
JETP Letters, 2004, Vol 80, Issue 11, p580
- ISSN
0021-3640
- Publication type
Article
- DOI
10.1134/1.1851638