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The equilibrium magnetization of granular high temperature superconductors in low fields: II. The model

✍ Scribed by D. Wohlleben; G. Michels; S. Ruppel

Publisher
Elsevier Science
Year
1991
Tongue
English
Weight
898 KB
Volume
174
Category
Article
ISSN
0921-4534

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✦ Synopsis

In the spontaneous flux expulsion of granular high temperature superconductors, only 1 /3 of the full Meissner effect is observed below HΒ’1, followed by full expulsion at H< Hm << HΒ’~. These deviations from the standard behavior of type-II superconductors are shown to be equilibrium effects caused by intrinsic and defect barriers with low conduction electron density. The influence of pinning is negligible. Hm is not an intrinsic property. Average sizes of the superconducting blocks between and of the Josephson loops around defect barriers can be extracted from the anomalous temperature and field dependence of the spontaneous flux expulsion.

πŸ“œ SIMILAR VOLUMES

Determination of the low critical magnet
Determination of the low critical magnetic fields in high temperature superconductor films
✍ J. BaszyΕ„ski πŸ“‚ Article πŸ“… 1994 πŸ› Elsevier Science 🌐 English βš– 126 KB

We present results of the determination of the lower critical magnetic fields: Josephson He1 J, nc2 J and Abrikosov Hcl J type for the Y-123 and Bi-2212 layers onto MgO substrate. Based on the DC magnetic field dependence of the real part Z" of complex AC susceptibility we assumed that He1J = 3.10e