Molecular beam epitaxy growth of a layered cuprate having a multiple fluorite-type block for use in trilayer junctions

(Pb2Cu)Sr2(Eu,Ce)nCu2Oy: n=3–8 (Pb-32n2 phase) has been synthesized by sequential deposition using the molecular beam epitaxy technique. This layered cuprate having a multiple-stacked fluorite-type block is thought to be suitable for use in trilayer Josephson junctions, from the viewpoints of atomic arrangement at the superconductor-insulator interface and the need for an atomically flat thin insulator. The thickness of the fluorite block, which will act as an intra-cell barrier, has been controlled up to 2.2 nm (n=8). Pb-3272/Pb-3212 epitaxial superlattices have also been prepared. The two-dimensional growth with the growth unit of a unit cell is observed by in situ reflection high-energy electron diffraction.