ACTA

Critical Currents, Magnetization and Microwave Absorption of (Tl_0.5Pb_0.5)Sr₂(Ca_0.8Gd_0.2)Cu₂O_z Superconductor

W.M. Woch^a, J. Niewolski^a, W. Tokarz^a, A. Kołodziejczyk^a, H. Sudra^b and G. Gritzner^b
^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 (Tl_0.5Pb_0.5)Sr₂(Ca_{1 - x}Gd_x)Cu₂O_z 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 T_c = 105.3 ± 0.2 K and the transition width Δ T_{90% - 10%} = 3.6 ± 0.2 K. The critical current of this superconductor is J_c = 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