| Autor: |
Z. Hao, G.V. Chandrashekhar, John R. Clem, F. Holtzberg, Lia Krusin-Elbaum, D. C. Cronemeyer, A. P. Malozemoff |
| Rok vydání: |
1990 |
| Předmět: |
|
| Zdroj: |
Physica A: Statistical Mechanics and its Applications. 168:367-377 |
| ISSN: |
0378-4371 |
| DOI: |
10.1016/0378-4371(90)90388-9 |
| Popis: |
Magnetization measurements on many single crystals of YBaCuO as well as BiSrCaCuO show a non-vanishing remanent magnetization in a region where the field-cooled and zero-field-cooled magnetizations coincide. We call this kind of remanence “residual irreversibility”. We argue that this behavior is not compatible with over-simplified critical-state models or surface barriers. We show how it can arise from weak “residual” pinning in a regime where vortices are further apart than the penetration depth and the reversible B ( H ) curve shows a sharp initial rise just above H cl . The “residual irreversibility” can be enhanced in crystals with an inhomogeneous or non-superconducting core, as seen in some of our thicker YBa/CuO crystals and also in BiSrCaCuO. We also show how the field-cooled Meissner fraction can measure the superconducting volume fraction in the low-field limit. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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