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: Article

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

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: Article

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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AU - Aksenov, V.

AU - Balagurov, A. M.

AU - Putilin, S. N.

AU - Rozova, M. G.

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