Neutron powder-diffraction studies of superconducting oxygenated and fluorinated Hg-1201 phases

E. V. Antipov, A. M. Abakumov, V. Aksenov, A. M. Balagurov, S. N. Putilin, M. G. Rozova

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Neutron powder-diffraction (NPD) experiments were carried out for monophasic oxygenated HgBa2CuO4+δ (Tc = 71,98 and 83 K) and fluorinated HgBa2CuO4Fδ (Tc = 97 and ∼ 80 K) samples with different oxygen or fluorine contents. The NPD refinements revealed a stoichiometric cation composition and extra anions were found to be located only in the middle of the Hg mesh. In both series the dependencies of Tc versus δ exhibit parabolic-shaped behavior, but these curves are shifted away from each other along the δ axis. NPD showed twice the amount of extra fluorine (δ ≈ 0.24 and 0.32) in comparison with those for the oxygenated Hg-1201 phases with comparable Tc's (δ = 0.12 and 0.19). This supports an ionic model of hole doping in Hg-1201: two holes per extra oxygen and one hole per extra fluorine. The structural data showed that the apical distances in Hg-1201 depend strongly on the number of dopant atoms rather than on their charge. The exchange of extra oxygen for a double amount of fluorine causes an enhanced shortening of the apical Cu-O bond distances, while the in-plane distances, as well as Tc, do not vary,

Original languageEnglish
Pages (from-to)773-779
Number of pages7
JournalPhysica B: Condensed Matter
Volume241-243
Publication statusPublished - 1997

Fingerprint

Neutron powder diffraction
Fluorine
fluorine
neutrons
Oxygen
diffraction
oxygen
Doping (additives)
Anions
Cations
mesh
Ion exchange
Negative ions
Positive ions
anions
cations
Atoms
causes
curves
Chemical analysis

Keywords

  • Fluorination
  • Hg-1201
  • Neutron powder diffraction

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Antipov, E. V., Abakumov, A. M., Aksenov, V., Balagurov, A. M., Putilin, S. N., & Rozova, M. G. (1997). Neutron powder-diffraction studies of superconducting oxygenated and fluorinated Hg-1201 phases. Physica B: Condensed Matter, 241-243, 773-779.

Neutron powder-diffraction studies of superconducting oxygenated and fluorinated Hg-1201 phases. / Antipov, E. V.; Abakumov, A. M.; Aksenov, V.; Balagurov, A. M.; Putilin, S. N.; Rozova, M. G.

In: Physica B: Condensed Matter, Vol. 241-243, 1997, p. 773-779.

Research output: Contribution to journalArticle

Antipov, EV, Abakumov, AM, Aksenov, V, Balagurov, AM, Putilin, SN & Rozova, MG 1997, 'Neutron powder-diffraction studies of superconducting oxygenated and fluorinated Hg-1201 phases', Physica B: Condensed Matter, vol. 241-243, pp. 773-779.
Antipov, E. V. ; Abakumov, A. M. ; Aksenov, V. ; Balagurov, A. M. ; Putilin, S. N. ; Rozova, M. G. / Neutron powder-diffraction studies of superconducting oxygenated and fluorinated Hg-1201 phases. In: Physica B: Condensed Matter. 1997 ; Vol. 241-243. pp. 773-779.
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