Magnetic properties of TlCaBaCuO4.5 compounds prepared from different starting materials |
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| Authors: | I. Kirschner S. Leppävuori R. Laiho A. D. Caplin T. Karman E. Lähderanta G. Zsolt A. Uusimäki J. Laverty T. Porjesz I. Halasz J. Levoska Gy. Kovacs |
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| Affiliation: | (1) Department for Low Temperature Physics, Roland Eötvös University, Puskin-u. 5-7, H-1088 Budapest, Hungary;(2) Microelectronics Laboratory, University of Oulu, SF-90570 Oulu, Finland;(3) Wihuri Physical Laboratory, University of Turku, SF-20500 Turku, Finland;(4) Imperial College, Centre for High Temperature Superconductivity, Prince Consort Road, SW7 London, England;(5) Central Research Institute for Chemistry, Pusztaszeri-u. 59-67, H-1025 Budapest, Hungary |
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| Abstract: | It has been shown, that different starting materials result in Tl–Ca–Ba–Cu–O superconductors of different type even at the same heat treatment process. This manifests itself in the developing structure, in the number, share-rate and superconducting properties of the occurring phases as well. Microcrystals, phase-compositions, crystallinities, unit cells, onset and critical temperatures, magnetic flux exclusions, critical currents, magnetizations and critical magnetic fields essentially unlike from each other have been observed, depending on the starting materials. The presence of a starting compound having low melting point, as Ba(NO3)2 can cause a more compact, better superconducting final product, implying better connection between the grains. |
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