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Process and Resistivity Studies of the High-T c Superconductors in Tl-Ca-Ba-Cu-O

1988; Institute of Physics; Volume: 27; Issue: 7A Linguagem: Inglês

10.1143/jjap.27.l1206

1347-4065

R. S. Liu, W. H Lee, Po‐Ting Wu, Y. C. Chen, Chien‐Kuo Chang,

Iron-based superconductors research

We report a method of sample preparation of thallium containing superconducting oxide system and the effects of subsequent heat treatment on superconducting properties of the compounds with the nominal composition TlCa 3 BaCu 3 O y , Tl 2 CaBa 2 Cu 2 O y and Tl 2 Ca 2 Ba 2 Cu 3 O y . Zero resistance at 123 K and the onset of superconductivity around 155 K have been achieved. In this paper, the optimum processing variables and the X-ray diffraction results are discussed.