Volume 42, Number 4, May II 1998
|Page(s)||461 - 466|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 September 2002|
The intrinsic crossing point of the magnetization vs. temperature curves in superconducting cuprates in the high-magnetic-field limit
Laboratorio de Bajas Temperaturas y Superconductividad,
Departamento de Física de la Materia Condensada, Universidad de Santiago
de Compostela - E15706 Spain
2 Departamento de Cristalografía, Universidad Complutense - E28040 Madrid, Spain
3 Laboratoire de Cristallographie et Sciences des Materiaux, CNRS F14050 Caen Cedex, France
4 Instituto de Ciencia de Materiales de Madrid, CSIC - E28049 Cantoblanco, Spain
5 Laboratoire de Chimie des Solides, Université Paris XI - F91405 Orsay Cedex, France
Accepted: 19 March 1998
The crossing point of the magnetization vs. temperature curves that appears below Tc in highly anisotropic superconducting cuprates was measured in different compounds, with a different number, N, of superconducting layers per periodicity length, s, and also with different values of s. By correcting the measurements from different extrinsic inhomogeneity effects through the Meissner fraction, it is demonstrated experimentally for the first time that in the high-magnetic-field limit the intrinsic crossing point may be explained at a quantitative level in terms of the Tesanović and coworkers approach based on thermal fluctuations of quasi-2D vortices (pancakes), with an effective periodicity length equal to s, independently of N.
PACS: 74.25.Ha – Magnetic properties / 74.40.+k – Fluctuations (noise, chaos, nonequilibrium superconductivity, localization, etc.) / 74.72.-h – High-Tc compounds
© EDP Sciences, 1998
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