Abstract
The low temperature scanning tunneling microscope (LTSTM) is used to study the local electronic properties on different crystallographic planes of Bi 2Sr 2CaCu 2O y single crystals in their normal and superconducting states. In different locations selected on the topographic images the I– V characteristics are measured at 4.2 K. In particular locations various features are observed: the superconducting gap, the Coulomb blockade and resonance tunnelling. Most of the observed spectroscopic characteristics indicate the strong Coulomb blockade induced by surface or impurity states. On some a− c planes of single crystals in the superconducting state the individual Cu-O and Bi-O layers can be recognized on the STM images owing to their different contributions to superconductivity.
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