Superconducting Pb-doped HgBa2CaCu2Oy films have been successfully synthesized on the (100) SrTiO3 substrate by laser ablation using a Pb-doped Hg-1212 target and post-annealing. The as-deposited film was post-annealed with a pellet of the same powders as those of the target at 760 °C for 20 min in an evacuated quartz tube. The obtained film exhibited the (00n) oriented x-ray diffraction pattern of the Hg-1212. The superconducting transition temperature, Tczero, was 117 K. Anisotropy of magnetization, M(T) and M-H curves in the directions of two different fields was confirmed.
The separation measurements of a bulk lifetime υo, front and back surface recombination velocities S0, Sw have been investigated for both 620 μm and 1.08 mm thick Si wafers with various surface treatments. The separation was made by applying bisurface photocoductivity decay method to the photoconductivity decay curves measured by 500 MHz microwave reflection under the bias light illumination. The bulk lifetime and the surface recombination velocities have been determined, respectively, to be 624–659 μs and 18.4–66.1 cm/s for the oxidized sliced-surface and 6285 cm/s for the sliced surface. And they have been also determined, respectively, to be 412–422 μs and <1 cm/s for the oxidized mirror polished-surface or the oxidized etched surface, 565–626 μs and 1042–1112 cm/s for the oxidized sandblasted-surface. The noncontact microwave BSPCD method with bias lights makes it possible to determine separately the bulk lifetime and surface recombination velocities in the front surface and backsurface in Si wafers with the wafer thickness for the practical use.
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.
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