A study of the reversible and irreversible magnetic properties of a Bi-2212 single crystal in high magnetic fields

M. Mittag, M. Rosenberg, D. Peligrad, R. Wernhardt, V.A.M. Brabers, J.H.P.M. Emmen, Dian-Wen Hu

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Abstract

A study of the magnetic properties of Bi-2212 single crystals in dependence on field, temperature and time has been carried out in fields up to 14T and in the temperature range 1.8-150 K. The field dependence of the critical current and pinning force density scales with the irreversibility field B*(T) leading to B*(0)=120 T for H//c and xi ab(0) approximately=16.5 AA. From an analysis of the irreversibility line in the framework of the vortex glass theory the 2D melting temperature of the vortex lattice and the 3D-2D crossover field was determined: TM2D approximately=29 K and B2D approximately=1.1 T. The magnetic relaxation processes yield very low activation energies of U0 approximately=15-20 meV for field directions perpendicular and parallel to the c axis. Deviations from simple logarithmic time decay were observed in the temperature range around 20 K. From an analysis of the reversible magnetization the penetration depth was estimated to be lambda ab approximately=1490 AA. The diamagnetism above the mean-field phase transition temperature can be described within the framework of a 2D fluctuation model.
Original languageEnglish
Pages (from-to)214-221
JournalSuperconductor Science and Technology
Volume7
DOIs
Publication statusPublished - 1994

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