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Proceedings Paper

Magnetization experiments on the thermal fluctuations of vortices and Cooper pairs in multilayered superconducting cuprates: how strongly coupled are the pancake vortices of the closest layers?
Author(s): Felix Vidal; Carolina Torron; Manuel V. Ramallo; Jesus Mosqueira
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Paper Abstract

To answer the question of the main title, which concerns central aspects of the vortex behavior in multi-layered high- temperature copper-oxide superconductors (HTSC), in this paper we review some of our recent measurements of the thermal fluctuation effects on the magnetization around the superconducting transition of high-quality single-crystals of different HTSC families, with a different number, N, of superconducting CuO2 layers per layering periodicity length, s. These results suggest that in highly-anisotropic multilayered HTSC the N successive pancakes in the closest N layers in s are strongly magnetically coupled but they are uncorrelated at longer distances. Therefore, they may be seen as an unique 'magnetic mille-feuilles' of N pancakes, with an effective thickness of the order of (N-1)-times the interlayer distance between the closest CuO2 layers in s. In contrast, in these highly-anisotropic HTSC the Josephson coupling between the CuO2 superconducting layers is very weak and the fluctuations of the Cooper pairs above Tc are strongly located in each CuO2 superconducting layer.

Paper Details

Date Published: 22 December 1998
PDF: 12 pages
Proc. SPIE 3481, Superconducting and Related Oxides: Physics and Nanoengineering III, (22 December 1998); doi: 10.1117/12.335913
Show Author Affiliations
Felix Vidal, Univ. de Santiago de Compostela (Spain)
Carolina Torron, Univ. de Santiago de Compostela (Spain)
Manuel V. Ramallo, Univ. de Santiago de Compostela (Spain)
Jesus Mosqueira, Univ. de Santiago de Compostela (Spain)

Published in SPIE Proceedings Vol. 3481:
Superconducting and Related Oxides: Physics and Nanoengineering III
Davor Pavuna; Ivan Bozovic, Editor(s)

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