Abstract
The results of the scanning tunneling microscopy/spectroscopy as well as transmission electron microscopy measurements on the bismuth cuprate superconductors Bi 2Sr 2CaCu 2O 8+ x in the ab-plane are reported. STM high-resolution images of cleaved single crystal reveal an atomic lattice and a superimposed incommensurate superstructure. We have also clearly seen this superstructure in high-resolution electron micrographs. Scanning tunneling microscopy of the deposited clusters yield information on the cluster shape. Scanning tunneling spectroscopy at low temperature allows identifying quantum size effect in individual Ni clusters.
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