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

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

研究成果: Article査読

23 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)2105-2107
ページ数3
ジャーナルApplied Physics Letters
65
16
DOI
出版ステータスPublished - 1994
外部発表はい

ASJC Scopus subject areas

  • 物理学および天文学(その他)

フィンガープリント

「Pb-doping effect on irreversibility fields of HgBa2Ca 2Cu3O8+δ superconductors」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル