The Irreversibility Fields of (Tl0.5Pb0.5) (Sr0.85Ba0.15)2Ca2Cu3Oz Film on Polished Silver Substrate
W.M. Wocha, R. Zaleckia, A. Kołodziejczyka, C. Deinhoferb, G. Gritzner andb
aFaculty of Physics and Applied Computer Science, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Kraków, Poland
bInstitute for Chemical Technology of Inorganic Materials, Johannes Kepler University, 4040 Linz, Austria
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Superconducting (Tl0.5Pb0.5)(Sr0.85Ba0.15)2Ca2Cu3Oz film was prepared on a highly polished, untextured silver substrate. A superconducting transition temperature (Tc,50%) of 114.7±0.3 K was obtained from the resistance versus temperature measurements for different applied ac currents. The density of the critical current measured by transport method was found to be 11.4×103 A/cm2 at 77 K in the self field. This value is smaller than the value calculated from ac susceptibility data: 53×103 A/cm2 at 77 K. The magnetical broadening of the resistivity transition to the superconducting state was observed. The irreversibility fields of the thallium based film were obtained from magnetoresistive measurements for both parallel to the c-axis and parallel to the ab plane showing the anisotropy according to the magnetic field direction. The irreversibility fields as a function of temperature were successfully fitted by the power law.
DOI: 10.12693/APhysPolA.111.737
PACS numbers: 74.25.Sv, 74.78.Bz, 74.62.Yb