Chemical doping and improved flux pinning in Hg-based superconductors

K. Kishio, J. Shimoyama, A. Yoshikawa, K. Kitazawa, O. Chmaissem, J. D. Jorgensen

Research output: Contribution to journalArticlepeer-review

47 Citations (Scopus)

Abstract

Chemical doping of a small amount (0.02∼0.3) of rhenium (Re) ion into HgBa2Can-1CunOy(n=1∼4) has been studied. The flux pinning strength in these Hg-based superconductors is significantly enhanced compared to the undoped parent materials. Neutron diffraction analysis of representative samples (n=3) revealed that Re partially substitutes the Hg-site with octahedrally fully coordinated oxygen atoms, giving rise to the stabilization of Hg(Re)O layer and reduction of this blocking layer thickness. Associated with the expected hybridization of Re-5d and O-2p orbitals and possible metallization of the Hg(Re)O layer, the improved flux pinning behavior is considered to be caused by the decrease of the electromagnetic anisotropy and the enhanced interlayer superconducting coupling strength.

Original languageEnglish
Pages (from-to)1359-1365
Number of pages7
JournalJournal of Low Temperature Physics
Volume105
Issue number5-6
DOIs
Publication statusPublished - 1996 Jan 1
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)
  • Condensed Matter Physics

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