Abstract
We have studied the magnetic field dependence of the temperature derivative of the resistivity, d ρ( H, T)/d T, of a number of Y 1− x Ca x Ba 2(Cu 1− y Zn y ) 3O 7− δ crystalline thin films over a wide range of sample compositions. From the analysis of the temperature derivative data we have been able to distinguish quite clearly between two characteristic temperature scales: (a) the onset of strong superconducting fluctuation temperature, T scf and (b) the pseudogap temperature, T PG. Significantly different characteristic features of d ρ( H, T)/d T at T scf and at T PG imply that T scf and T PG have different physical origins.
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