New Hg based oxycarbonate superconductor HgBa2Sr2Cu2O6+δ(CO3)

M. Uehara, S. Sahoda, H. Nakata, J. Akimitsu, Y. Matsui

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37 Citations (Scopus)

Abstract

A new Hg based oxycarbonate superconductor HgBa2Sr2Cu2O6+δ(CO3) has been found by resistivity and magnetization measurements. The superconductivity has been observed at 66 K by magnetization measurement. The electron-diffraction and HRTEM studies show that the crystal structure basically consisted of [HgBa2O2+δ] and [Sr2CO3] block layers and has a tetragonal unit cell, with a=3.88 A ̊, c=16.94 A ̊, with an orthorhombic superstructure, with A≈4.5√2a=24.71 A ̊,B≈√2a=5.49 A ̊, C=c=16.94 A ̊, due to the three times periodic replacements of a CO3 block for HgOδ in the same c-planes or to a c/2 shift approximately at intervals of three tetragonal cells along the (110) direction. The crystal structure of this compound is described by the following combination: [(Hg0.5C0.5)(Ba,Sr)2O2.5+δ]+CuO2+[(Ba,Sr)2(C0.5Hg0.5)O2.5+δ]+CuO2.

Original languageEnglish
Pages (from-to)27-32
Number of pages6
JournalPhysica C: Superconductivity and its applications
Volume222
Issue number1-2
DOIs
Publication statusPublished - Mar 10 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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