Brazilian Journal of Physics
On-line version ISSN 1678-4448
GONZALEZ, J.L.; CAIXEIRO, E.S. and MELLO, E.V.L. de. Unconventional magnetic properties of cuprates. Braz. J. Phys. [online]. 2003, vol.33, n.4, pp. 758-761. ISSN 1678-4448. http://dx.doi.org/10.1590/S0103-97332003000400025.
Recently experiments on high critical temperature superconductors have shown that the doping levels and the superconducting gap are usually not uniform properties but strongly dependent on their positions inside a given sample. We show here that the large diamagnetic signal above the critical temperature Tc and the unusual temperature dependence of the upper critical field Hc2 with the temperature can be explained taking the inomo-geneities and a distribution of different local critical temperatures into account.