Residual irreversibility in high-Tc superconductors

L. Krusin-Elbaum, A.P. Malozemoff, D.C. Cronemeyer, F. Holtzberg, G.V. Chandrashekhar, J.R. Clem and Z. Hao

Physica A: Statistical Mechanics and its Applications, 1990, vol. 168, issue 1, 367-377

Abstract: 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 Hcl. 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.

Date: 1990
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:168:y:1990:i:1:p:367-377

DOI: 10.1016/0378-4371(90)90388-9

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