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?

Felix Vidal; Carolina Torron; Manuel V. Ramallo; Jesus Mosqueira

doi:10.1117/12.335913

22 December 1998 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?

Felix Vidal, Carolina Torron, Manuel V. Ramallo, Jesus Mosqueira

Author Affiliations +

Proceedings Volume 3481, Superconducting and Related Oxides: Physics and Nanoengineering III; (1998) https://doi.org/10.1117/12.335913
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1998, San Diego, CA, United States

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 T_c are strongly located in each CuO₂ superconducting layer.

Citation Download Citation

Felix Vidal, Carolina Torron, Manuel V. Ramallo, and Jesus Mosqueira "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?", Proc. SPIE 3481, Superconducting and Related Oxides: Physics and Nanoengineering III, (22 December 1998); https://doi.org/10.1117/12.335913

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