STRUCTURE OF THIN AG AND AU FILMS ON BI2SR2CACU2O8-RAY PHOTOELECTRON DIFFRACTION(X DETERMINED WITH X)

In order to obtain microscopic information on the Ag/Bi2Sr2CaCu2O8+x a nd Au/Bi2Sr2CaCu2O8+x interfaces we have investigated the structure of Ag and Au films on Bi2Sr2CaCu2O8+x(001) single crystals with x-ray ph otoelectron diffraction. Although Ag and Au are very similar from a cr ystallographic and electronic point of view, we find considerable diff erences. Our results show that Ag forms islands on the Bi2Sr2CaCu2O8+x surface and that about 50% of the Ag is ordered in two (110) domains which are rotated by 109 degrees. Au, however, wets the surface much b etter and about 20% of the deposited Au forms two (111) domains rotate d by 180 degrees.