Upper critical fieldHc2calculations for the high critical temperature superconductors considering inhomogeneities

2003/03/31 by E. S. Caixeiro, E.S. Caixeiro, J. L. González +2
Physics and Astronomy · #Advanced Condensed Matter Physics #Physics of Superconductivity and Magnetism #Theoretical and Computational Physics #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevb.69.024521

published as Physical Review B 69, 024521 (2004) · Latex text, add references

openalex publication_date 2004/01/29 · arxiv created 2004/02/03 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

We perform calculations to obtain the H_c2 curve of high temperature superconductors (HTSCs). We consider explicitly the fact that HTSCs possess intrinsic inhomogeneities by taking into account a nonuniform charge density \ensuremathρ(r). The transition to a coherent superconducting phase at a critical temperature T_c corresponds to a percolation threshold among different superconducting regions, each one characterized by a given T_c(\ensuremathρ(r)). Within this model we calculate the upper critical field H_c2 by means of an average linearized Ginzburg-Landau equation modified to take into account the distribution of local superconducting temperatures T_c[\ensuremathρ(r)]. This approach explains some of the anomalies associated with H_c2 and why several properties like the Meissner and Nernst effects are detected at temperatures much higher than T_c.

Citations

• Inherent inhomogeneities in tunneling spectra ofBi2Sr2CaCu2O8−xcrystals in the superconducting state
• Onset of the vortexlike Nernst signal aboveTcinLa2−xSrxCuO4andBi2Sr2−yLayCuO6
• Upper Critical Field in a Spin-Charge Separated Superconductor
• The pseudogap in high-temperature superconductors: an experimental survey