Abstract
The vortex lattice in extremely anisotropic superconductors has many intriguing properties. These pecularities are very predominant in the oxidic cuprates, especially the Bi and Tl compounds, where they determine new regimes in the field-temperature phase diagram. They are also responsible for the weak flux pinning in extended regions of the mixed state, and cause a relatively large flux creep decay of the magnetization even at low temperatures. In the first part of this contribution several pin mechanisms in Bi:2212 and Y:123 are discussed and compared with experimental results, e.g. pinning by (oxygen) vacancies in the CuO2 layers and by screw dislocations in Y:123 films. In the second part we concentrate on thermally activated phenomena, mainly flux creep. Numerical solutions of the creep equation by Van der Beek et al. are compared to an approximate analytical solution both for collective creep and a logarithmic creep model. Finally, experimental results of magnetic relaxation in Bi:2212 single crystals are analyzed in terms of the models just described.
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Kes, P.H. (1993). Theory and Experiment of Flux Pinning and Flux Creep in High T c Superconductors. In: Riste, T., Sherrington, D. (eds) Phase Transitions and Relaxation in Systems with Competing Energy Scales. NATO ASI Series, vol 415. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-1908-5_4
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DOI: https://doi.org/10.1007/978-94-011-1908-5_4
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