A primarily single phase compound of composition (Tl0.5Pb 0.5)Sr2(Eu2-xCex)Cu 2O9 (where x ranges from ≪0.1 to 0.17) has been synthesized in the so-called 1222 structure. Bulk superconductivity near 40 K is induced via oxygen doping in 100 bar of oxygen at 550°C. The material has been structurally characterized by diffraction and high-resolution lattice imaging techniques. The lattice images reveal the presence of some intergrowths of a 1212 structure nonsuperconducting (Tl0.5Pb0.5)Sr 2EuCu2O7 phase in the bulk 1222 structure of the parent compound and indications of periodicity that suggest the possible existence of a new, composite structure 2434 phase.
ASJC Scopus subject areas
- Physics and Astronomy(all)