Two-dimensional fluctuations in the magnetization of the high-temperature superconductor LaBaCaCu3O7-delta

Citation
Dal. Tellez et al., Two-dimensional fluctuations in the magnetization of the high-temperature superconductor LaBaCaCu3O7-delta, J MAGN MAGN, 226, 2001, pp. 339-341
Citations number
9
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
ISSN journal
03048853 → ACNP
Volume
226
Year of publication
2001
Part
1
Pages
339 - 341
Database
ISI
SICI code
0304-8853(200105)226:<339:TFITMO>2.0.ZU;2-M
Abstract
We report measurements of magnetization and diamagnetic susceptibility in p olycrystalline LaBaCaCu3O(7) (-delta) in high magnetic fields (20-50 kOe). The sample has a zero-field transition temperature T-co = 77 K and a transi tion width of 2.0K. The results show large fluctuation effects, which can b e explained by Ginzburg-Landau fluctuation theory for a two-dimensional sys tem. Using a theoretical model based on the lowest Landau-levels approximat ion. the magnetization data are fitted with good agreement. The weak-field fluctuation diamagnetic susceptibility above T-c can be fitted well in term s of the 2D Lawrence-Doniach model. (C) 2001 Elsevier Science B.V. All righ ts reserved.