ACTA

Penetration Depth of Tl₂Ba₂Ca₂Cu₃O_y and Tl_0.58Pb_0.4Sr_1.6Ba_0.4Ca₂Cu₃O_y Bulk Superconductors

R. Zalecki^a, W.M. Woch^a, A. Kołodziejczyk^a, W.T. Konig^b and G. Gritzner^b
^aSolid State Physics Department, Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, Cracow, Poland
^bInstitute for Chemical Technology of Inorganic Materials, Johannes Kepler University, Linz, Austria

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The penetration depths of bulk Tl₂Ba₂Ca₂Cu₃O_y and Tl_0.58Pb_0.4Sr_1.6Ba_0.4Ca₂Cu₃O_y superconductors with the critical temperatures 112 K and 114 K, respectively, were determined from the AC susceptibility measurements. When the samples are in the Meissner state, the dispersive components of AC susceptibility as well as their temperature dependences reflect the changes of the penetration depths at various temperatures. In these bulk ceramic superconductors the penetration depths are of the order of few μm and they are comparable to the grains sizes in the ceramics.

DOI: 10.12693/APhysPolA.126.A-133
PACS numbers: 74.72.-h, 74.25.Ha, 74.25.Wx, 74.20.De