LEED-AES observations of 7 K- and 80 K-phase Bi-Sr-Ca-Cu-O single crystals

LEED and AES observations were made on the clean surfaces of 7 K- and 80 K-phase Bi-Sr-Ca-Cu-O single crystals. It is clear that the surface structure of the 7 K-phase crystal is the same as that of the 80 K-phase crystal. The clean surfaces of the specimens are very stable without any adsorption of CO 2 and O 2 gases. However, in light of the fact that the intensity of carbon becomes greater in the AES spectrum after baking a chamber, the active carbon compounds are thought to be adsorbed on the clean surfaces of the 7 K- and 80 K-phase single crystals.