Synthesis and superconductivity of oxycarbonates of the Tl-1201 phase

M. Kikuchi, E. Ohshima, N. Ohnishi, Y. Muraoka, S. Nakajima, E. Aoyagi, M. Ogawa, J. Akimitsu, T. Oku, K. Hiraga, Y. Syono

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Abstract

TlBaxSr4-xCu2(CO3)Oy oxycarbonates with the Tl-1201 structure were synthesized over a wide range of x (1.0≤x ≤3.2) and examined by X-ray powder diffraction, electron diffraction, high-resolution electron microscopy and magnetometry methods. New phases with the Tl-1201 structure having 6 and 7 times periodicities along the b-axis were isolated. The former was stable for a wide Ba-rich range (1.8≤x≤3.2), and the latter was observed for a smaller Ba content range (1.2≤x≤1.6). The phase stability was found to depend on the synthesis condition. The maximum Tc of the as-synthesized specimen in this series occurred at about 70 K around x=2.0. The Meissner volume fraction of the as-synthesized specimen (x=2.4) was 30% at 5 K.

Original languageEnglish
Pages (from-to)200-204
Number of pages5
JournalPhysica C: Superconductivity and its applications
Volume219
Issue number1-2
DOIs
Publication statusPublished - Jan 1 1994
Externally publishedYes

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ASJC Scopus subject areas

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

Cite this

Kikuchi, M., Ohshima, E., Ohnishi, N., Muraoka, Y., Nakajima, S., Aoyagi, E., Ogawa, M., Akimitsu, J., Oku, T., Hiraga, K., & Syono, Y. (1994). Synthesis and superconductivity of oxycarbonates of the Tl-1201 phase. Physica C: Superconductivity and its applications, 219(1-2), 200-204. https://doi.org/10.1016/0921-4534(94)90035-3