Enhancement of Tc in HgBa2Ca2Cu3O8+δ by fluorination

K. A. Lokshin, D. A. Pavlov, S. N. Putilin, E. V. Antipov, D. V. Sheptyakov, A. M. Balagurov

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Abstract

A 4 K increase of Tc in Hg-1223 was achieved by the exchange with fluorine of the extra oxygen located in (HgOδ) layer. Fluorination of the initially reduced Hg-1223 samples with Tc ≃ 100 K by XeF2 results in the increase of Tc up to 138 K while treatment in oxygen flow causes the enhancement of Tc not higher than up to 134 K. From x-ray and neutron diffraction data we conclude that shortening of the in-plane Cu-O distances without significant (CuO2) layers buckling in fluorinated Hg-1223 seems to be the main structural factor responsible for the enhancement of Tc.

Original languageEnglish
Article number064511
Pages (from-to)645111-645115
Number of pages5
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume63
Issue number6
Publication statusPublished - 2001
Externally publishedYes

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