C-axis oriented (Hg,Ti)-based superconducting films with T c>125 K

F. Foong, B. Bedard, Q. L. Xu, S. H. Liou

Research output: Contribution to journalArticle

Abstract

Thin films with mostly (Hg,Tl)1Ba2Ca 3Cu2O8+δ [(Hg,Tl)-1223] phase have been fabricated by radio frequency magnetron sputtering of precursor films and post-annealing method. The doping of a small amount of thallium in the film is helpful to the formation of the three-layer CuO2 compound. These films have a highly oriented structure with the c-axis perpendicular to the film surface. Resistivity measurements show that the films after annealing at 300°C for 1 h in O2 have the superconducting transition temperature of Tc(onset)=133 K and Tc(zero)=127 K. Scanning electron micrographs of the film reveal platelike micrometer-size grains coalesce to cover the substrate surface.

Original languageEnglish (US)
Number of pages1
JournalApplied Physics Letters
StatePublished - 1995

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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