GROWTH MODE OF SUPERCONDUCTING LA2-XSRXCU1-FILMS ON LAALO3 SUBSTRATE(YO4 THIN)

La2-xSrxCu1+yO4 (LSCO) thin films sputtered from a Cu-rich target on a LaAlO3 substrate showed a columnar structure. The columnar grains pen etrated the full thickness of the film, nucleating at the substrate su rface defects. Transmission electron microscopy revealed two kinds of lattice images: one with a lattice spacing of 0.66 nm and the other wi th a spacing of 0.61 nm. The 0.66 nm spacing denotes a c-axis oriented LSCO film matrix. The 0.61 nm spacing has two categories: one with sh ort white dashes, the phase of which is not yet identified, the other with no additional structure, which could correspond to the c-axis dev iated LSCO.