Synthesis, transport, magnetization and structural characterizations of Tl-Ca-Ba-Cu-O specimens with T0=123 K and Tonset=155 K

P. T. Wu*, R. S. Liu, J. M. Liang, W. H. Lee, Li Chang, L. J. Chen, C. T. Chang

*Corresponding author for this work

Research output: Contribution to journalArticle

13 Scopus citations

Abstract

A stable, reproducible and bulk superconductor of Tl-Ca-Ba-Cu-O (TCBCO) compound with T0 above 120 K and Tonset=155 K has been prepared. Measurements of electrical and magnetic properties are reported. On the basis of the transmission electron microscopy and X-ray diffraction analyses, the predominant phase was determined to be a body-centered tetragonal structure (a=b=0.557 nm, c=3.77 nm) with a space group of I4/mcm. The composition ratios of Tl, Ca, Ba and Cu of the phase were determined by energy dispersive spectrometry to be 1:2:3:4. A probable structure model involving four layers of Cu-O interposed between Tl-O layers is proposed.

Original languageEnglish
Pages (from-to)109-112
Number of pages4
JournalPhysica C: Superconductivity and its Applications
Volume156
Issue number1
DOIs
StatePublished - 1 Aug 1988

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