Abstract
Thin films of YBa 2Cu 3O 7−δ (YBCO) have been grown on Mg 2TiO 4 substrate layers by pulsed laser deposition. The substrate temperature T s has been varied between 600 and 800°C in order to optimize the YBCO film growth. All samples were characterized by means of X-ray diffraction, scanning electron microscopy (SEM) and scanning tunneling microscopy (STM). We have found an optimum T s in the range of 675–700°C where the YBCO thin films show perfect (001) orientation. SEM and STM reveal that the (001) oriented YBCO films have very flat surfaces. STM shows a large number of spiral growth hills and steps of unit cell height. These films exhibit a superconducting transition temperature T c (onset) at 88.5 K and a zero resistance at 86.5 K. Films grown at lower substrate temperatures show no (001) orientation, but (100) and (110)/(103) orientations. At higher T s additional (100) oriented grains occur.
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