Temperature dependence of the upper critical field of type-II superconductors from isothermal magnetization data. Application to high temperature superconductors

摘要

Using the Ginzburg-Landau theory in very general terms, we develop a simplescaling procedure which allows to establish the temperature dependence of theupper critical field and the value of the superconducting critical temperatureTc of type-II superconductors from measurements of the reversible isothermalmagnetization. An analysis of existing experimental data shows that thenormalized dependencies the upper critical field on T/Tc are practicallyidentical for all families of high temperature superconductors at alltemperatures for which the magnetization data are available.