Structure and Superconducting Properties of HgBa2CaCu2Oy Films Prepared by Laser Ablation

Abstract

Hg-1212 films were prepared on the (100) SrTiO₃ substrate by laser ablation and subsequent annealing. The as-grown film was annealed with a Hg-1212 bulk pellet in a quartz tube. The superconducting transition temperature T _c(onset) was 123 K and T _c(ρ=0) was 97 K. This film was shown to have a preferential orientation of the c-axis perpendicular to the (100) SrTiO₃ substrate, and was composed of Hg-1212 platelike grains and Ba–Cu–O compounds.