Structural features, oxygen and fluorine doping in Cu-based superconductors

E. V. Antipov, S. N. Putilin, R. V. Shpanchenko, V. A. Alyoshin, M. G. Rozova, A. M. Abakumov, D. A. Mikhailova, A. M. Balagurov, O. Lebedev, G. Van Tendeloo

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

The variation of structures and superconducting properties by changing extra oxygen or fluorine atoms concentration in Hg-based Cu mixed oxides and YBa2Cu3O6+δ was studied. The data obtained by NPD study of Hg-1201 can be considered as an evidence of the conventional oxygen doping mechanism with 2δ holes per (CuO2) layer. The extra oxygen atom was found to be located in the middle of the Hg mesh only. Different formal charges of oxygen and fluorine inserted into reduced 123 structure results in its distinct variations. The fluorine incorporation into strongly reduced YBa2Cu3O6+δ causes a significant structural rearrangement and the formation of a new compound with a composition close to YBa2Cu3O6F2 (tetragonal a=3.87Å and c≈13 Å), which structure was deduced from the combined results of X-ray diffraction, electron diffraction and high resolution electron microscopy. Fluorination treatment by XeF2 of nonsuperconducting 123 samples causes an appearance of bulk superconductivity with Tc up to 94K.

Original languageEnglish
Pages (from-to)61-64
Number of pages4
JournalPhysica C: Superconductivity and its Applications
Volume282-287
Issue numberPART 1
DOIs
Publication statusPublished - Aug 1997
Externally publishedYes

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