Effect of fluorination on the structure and superconducting properties of the hg-1201 phase

A. M. Abakumov, V. L. Aksenov, V. A. Alyoshin, E. V. Antipov, A. M. Balagurov, D. A. Mikhailova, S. N. Putilin, M. G. Rozova

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Abstract

A fluorination of the reduced HgBa2CuO4+δ(Hg-1201) with Tc=61K resulted first in an increase in Tc up to 97 K and then in a decrease and even a suppression of superconductivity due to overdoping. Neutron powder refinements performed on fluorinated HgBa2CuO4Fδ showed twice the amount of extra fluorine in comparison with those for the oxygenated -1201 phases with close Tc. This supports the ionic model of doping in Hg-1201: two holes per oxygen and one hole per fluorine. The apical distances in Hg-1201 depend on the number of dopant atoms rather than on their charge. The exchange of extra oxygen for a double amount of fluorine shortens the apical Cu-O distances, while the in-plane distances and Tc do not vary.

Original languageEnglish
Pages (from-to)385-388
Number of pages4
JournalPhysical review letters
Volume80
Issue number2
DOIs
Publication statusPublished - jan. 1 1998

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Abakumov, A. M., Aksenov, V. L., Alyoshin, V. A., Antipov, E. V., Balagurov, A. M., Mikhailova, D. A., Putilin, S. N., & Rozova, M. G. (1998). Effect of fluorination on the structure and superconducting properties of the hg-1201 phase. Physical review letters, 80(2), 385-388. https://doi.org/10.1103/PhysRevLett.80.385