A new homologous series of oxycarbonate superconductors Sr2(Ca,Sr)n-1Cun(CO3)1-χ(BO3)χOy (n=1, 2 and 3)

M. Uehara, M. Uoshima, S. Ishiyama, H. Nakata, J. Akimitsu, Y. Matsui, T. Arima, Y. Tokura, N. Mori

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Abstract

A new homologous series of oxycarbonate superconductors Sr2(Ca,Sr)n-1Cun(CO3)1-χ(BO3)χOy (n=1, 2 and 3) prepared under high pressure have been found by resistivity and magnetization measurements. X-ray powder diffraction and HRTEM studies show that these phases have tetragonal structures with a=3.86 A ̊ and c=7.40 A ̊ for n=1, a=3.86 A ̊ and c=10.62 A ̊ for n=2, and a=3.87 A ̊ and c=13.98 A ̊ for n=3. Resistivity and magnetization measurements revealed that superconducting transition temperatures were 50, 105 and 115 K for n=1-3, respectively. These Tc's are higher than those of the structurally related analogous TlBa2Can-1CunO2n+3 at 100 and 110 K (n=2 and 3).

Original languageEnglish
Pages (from-to)310-314
Number of pages5
JournalPhysica C: Superconductivity and its applications
Volume229
Issue number3-4
DOIs
Publication statusPublished - Aug 15 1994
Externally publishedYes

ASJC Scopus subject areas

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

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