Structure and superconductivity in Cr-substituted HgBa2CuO4+δ

O. Chmaissem*, J. D. Jorgensen, D. G. Hinks, B. G. Storey, B. Dabrowski, H. Zhang, L. D. Marks

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

Chromium-substituted Hg1-x.CrxBa2CuO4+δ compounds have been synthesized. Cr can be incorporated into the structure with a solubility limit around x ≈ 0.27. Cr substitutes at the Hg site and is tetrahedrally coordinated to four oxygen atoms. Two of these are apical oxygen atoms that have moved to new positions (O2′) and two are in the Hg/Cr plane (O3) at a (x x 0) site. Additional oxygen atoms (O4) in the Hg/Cr plane at (1/2 1/2 0) affect the carrier concentration, as for HgBa2CuO4+δ. In the as-synthesized samples, Tc decreases with increasing Cr content. Attempts to adjust the carrier concentration by post annealing in oxygen at low temperature destroy superconductivity because the samples are metastable under ambient conditions.

Original languageEnglish (US)
Pages (from-to)1-10
Number of pages10
JournalPhysica C: Superconductivity and its applications
Volume279
Issue number1-2
DOIs
StatePublished - May 15 1997

Keywords

  • Chromium substitution
  • Mercury-based superconductors
  • Neutron diffraction
  • Structural analysis
  • Superconductivity

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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