Critical Currents, Magnetization and Microwave Absorption of (Tl0.5Pb0.5)Sr2(Ca0.8Gd0.2)Cu2Oz Superconductor
W.M. Wocha, J. Niewolskia, W. Tokarza, A. Kołodziejczyka, H. Sudrab and G. Gritznerb
aSolid State Physics Department, Faculty 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, Altenbergerstr. 69, 4040 Linz, Austria
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The bulk (Tl0.5Pb0.5)Sr2(Ca1 - xGdx)Cu2Oz superconductors with x = 0.1, 0.2 and 0.3 have unique and very interesting magnetic and electrical properties. In this paper we focused our attention on the superconductor with gadolinium content x = 0.2. We measured the magnetic field dependences of the transport critical currents, the microwave absorption as well as the magnetization for different temperatures. The critical temperature of this sample is Tc = 105.3 ± 0.2 K and the transition width Δ T90% - 10% = 3.6 ± 0.2 K. The critical current of this superconductor is Jc = 1 820 ± 10 A/cm2 at 77 K. The data were analyzed within the frame of the Bean and Kim models as well as the percolation model.
DOI: 10.12693/APhysPolA.118.319
PACS numbers: 74.81.Bd, 74.25.Sv, 74.81.Fa