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

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

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

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
Volume65
Issue number16
DOIs
Publication statusPublished - 1994
Externally publishedYes

Fingerprint

temperature
titration
x ray spectroscopy
magnetic properties
annealing
oxygen
curves
gases
energy

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Pb-doping effect on irreversibility fields of HgBa2Ca 2Cu3O8+δ superconductors. / Isawa, Kazuyuki; Yamamoto, Ayako; Itoh, Makoto; Adachi, Seiji; Yamauchi, H.

In: Applied Physics Letters, Vol. 65, No. 16, 1994, p. 2105-2107.

Research output: Contribution to journalArticle

Isawa, Kazuyuki ; Yamamoto, Ayako ; Itoh, Makoto ; Adachi, Seiji ; Yamauchi, H. / Pb-doping effect on irreversibility fields of HgBa2Ca 2Cu3O8+δ superconductors. In: Applied Physics Letters. 1994 ; Vol. 65, No. 16. pp. 2105-2107.
@article{5dde4ff9c00e49a8aeddb3487b84243c,
title = "Pb-doping effect on irreversibility fields of HgBa2Ca 2Cu3O8+δ superconductors",
abstract = "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.",
author = "Kazuyuki Isawa and Ayako Yamamoto and Makoto Itoh and Seiji Adachi and H. Yamauchi",
year = "1994",
doi = "10.1063/1.112807",
language = "English",
volume = "65",
pages = "2105--2107",
journal = "Applied Physics Letters",
issn = "0003-6951",
publisher = "American Institute of Physics Publising LLC",
number = "16",

}

TY - JOUR

T1 - Pb-doping effect on irreversibility fields of HgBa2Ca 2Cu3O8+δ superconductors

AU - Isawa, Kazuyuki

AU - Yamamoto, Ayako

AU - Itoh, Makoto

AU - Adachi, Seiji

AU - Yamauchi, H.

PY - 1994

Y1 - 1994

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=0041519845&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0041519845&partnerID=8YFLogxK

U2 - 10.1063/1.112807

DO - 10.1063/1.112807

M3 - Article

VL - 65

SP - 2105

EP - 2107

JO - Applied Physics Letters

JF - Applied Physics Letters

SN - 0003-6951

IS - 16

ER -