New members in the family of Hg and Tl based superconductors Hg1-xTlxBa2(Ca0.86Sr0.14)2Cu3O8+δ

Nam H. Hur, Nae H. Kim, Kyu W. Lee, Kyung-hwa Yoo, Yong K. Park, Jong C. Park

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Abstract

A new family of superconducting cuprate oxides based on mercury and thallium, Hg1-xTlxBa2(Ca0.86Sr0.14)2Cu3 O8+δ (x=0.25, 0.50, 0.75; denoted as Hg, Tl-1223), have been synthesized. All the diffraction lines of the samples were well indexed on the tetragonal "1223" (space group: P4/mmm) structure. X-ray powder diffraction data and EPMA results suggest that the compounds form complete ranges of solid solution. The superconducting transition temperatures for the as-synthesized samples are at about 124 to 128 K. After annealing in an argon atmosphere at 400°C for 6 h, the Tc's of the samples with x=0.25 and 0.50 have been found to increase to 132 K. The Tl substituted compounds are quite stable up to 550°C whereas pristine HgBa2(Ca0.86Sr0.14)2Cu3O8+δ starts to decompose below 300°C. The intra-grain critical current density of Hg, Tl-1223 largely enhances as the thallium content increases. The Tl in Hg, Tl-1223 plays significant roles not only to stabilize the Hg-1223 phase but also to enhance the pinning properties.

Original languageEnglish
Pages (from-to)19-23
Number of pages5
JournalPhysica C: Superconductivity and its Applications
Volume234
Issue number1-2
DOIs
Publication statusPublished - 1994 Dec 1

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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