Abakumov, Artem M.

Alyoshin, V.A.

Antipov, E.V.

Balagurov, A.M.

Lebedev, Oleg

Mikhailova, D.A.

Putilin, S.N.

Rozova, M.G.

Shpanchenko, R.V.

Van Tendeloo, Gustaaf

Abstract: The variation of structures and superconducting properties by changing extra oxygen or fluorine atoms concentration in Hg-based Cu mixed oxides and YBa2Cu3O6+delta was studied. The data obtained by NPD study of Hg-1201 can be considered as an evidence of the conventional oxygen doping mechanism with 2 delta 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+delta causes a significant structural rearrangement and the formation of a new compound with a composition close to YBa2Cu3O6F2 (tetragonal alpha = 3.87 Angstrom and c approximate to 13 Angstrom), 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 T-c up to 94K

Institutional Repository Universiteit Antwerpen

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

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

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Institutional Repository Universiteit Antwerpen