Physics – Condensed Matter – Superconductivity
Scientific paper
2008-02-05
J. Phys.: Condens. Matter 20, 275229 (2008) .
Physics
Condensed Matter
Superconductivity
3 pages, 1 figure
Scientific paper
10.1088/0953-8984/20/27/275229
By comparison of recent direct measurements of the temperature dependence of the upper critical field $H_{c2}$ in an Y-123 high temperature superconductor with the scaling analysis of magnetization data, collected in fields H << H_c2, we demonstrate that that the temperature dependence of the Ginzburg-Landau parameter kappa is negligible. Another conclusion is that the normalized temperature dependence of H_c2 is independent of the orientation of the magnetic field in respect to crystallographic axes of the sample. We also discuss that isotropy of the temperature dependence of H_c2 straightforwardly follows from the Ginzburg-Landau theory if kappa does not depend on temperature.
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