Pb-doping effect on irreversibility fields of HgBa2Ca 2Cu3O8+δ superconductors

Kazuyuki Isawa, Ayako Tokiwa-Yamamoto, Makoto Itoh, Seiji Adachi, H. Yamauchi

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We prepared nearly single-phase polycrystalline samples of HgBa 2Ca2Cu3O8+δ(Hg-1223) without and with Pb doping, i.e., Pb-free Hg-1223 and (Hg0.8Pb 0.2)-1223, by means of a sample encapsulation technique. According to quantitative energy dispersive x-ray spectroscopy analyses and iodometric oxygen titration, the Pb-free Hg-1223 and the (Hg0.8Pb 0.2)-1223 sample were identified to be Hg0.97Ba 2.00Ca2.04Cu3.00O8.33 and (Hg 0.79Pb0.29)Ba2.00Ca1.98Cu 2.94O8.42, respectively. The highest Meissner-signal onset temperatures for the Pb-free Hg-1223 (after post-annealing in O2 gas) and the (Hg,Pb)-1223 (as-sintered) sample were observed at 135.4 and 132.0 K, respectively. The difference in the irreversibility fields (Hirr) for both samples was very small at temperatures above 80 K, while, at temperatures below 70 K, the Hirr versus T curve for the (Hg,Pb)-1223 sample shifted toward the higher field side. Thus, Pb doping was effective for the improvement of magnetic property of Hg-1223 superconductors, at least, at temperatures below 70 K.

Original languageEnglish
Pages (from-to)2105-2107
Number of pages3
JournalApplied Physics Letters
Issue number16
Publication statusPublished - 1994
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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