Simplified Josephson junction arrays as models of granular superconductors

✍ Scribed by Sandro Pace; Roberto De Luca; Aniello Saggese

• Book ID: 103938161
• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 175 KB
• Volume: 194-196
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/0921-4526(94)91275-0

✦ Synopsis

We describe the simplest Josephson junction array models that can be adopted in studying the diamagnetic properties of granular superconductors. We consider cylindrical superconducting granular samples in the presence of an axial external magnetic field H. The electrodynamic response of these systems can be analyzed by means of three-dimensional (3D) equivalent networks of Josephson junctions coupled through inductances. However, in the low field reversible regime a 2D Josephson junction array can be used. In order to study irreversible flux penetration in 3D systems, we give the equivalent network and qualitatively discuss the dynamics of flux penetration. We notice that, in analogy to 2D networks, First Irreversible Flux Penetration (FIFP) occurs when the value of the shielding current approaches the maximum Josephson current in the weakest external junction of the network.