Magnetic flux penetration into Josephson networks in a critical state

✍ Scribed by V.V. Bryksin; A.V. Goltsev; S.N. Dorogovtsev

• Book ID: 103943562
• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 504 KB
• Volume: 172
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(90)90628-r

✦ Synopsis

A theory of magnetic field penetration in a critical state is derived for Josephson networks (i.e.. for granular superconductors ) when magnetic fields thread through intergranular Josephson junction regions rather than through grains. In the framework of a microscopic approach we find the critical current J¢(B) as a function of magnetic induction B and the magnetic field profiles, which in some special cases are described by the well-known phenomenological theories of Bean and Kim and Anderson. In some cases Jc(B) has an oscillating character that relates to a step structure of B(.~:). 2D Josephson networks are studied. We find that the profile of a magnetic field threading through a Josephson network can be no steeper than that described by the Kim-Anderson model.