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- W790732848 abstract "Scanning tunneling microscopy images and scanning tunneling spectroscopy characteristics were measured at 4.2 K in liquid helium bath on the cleaved in air α —b surface of Bi2Sr2CaCu2O8 (BSCCO-2212). Electronic densities of states and superconductivity parameters 6 and r evaluated from dl/dV characteristics depend on tip—sample distance s: with shortening of the distance s superconducting gap structure becomes more distinct, i.e. 6 increases and F decreases. We explain this phenomenon as a non-vacuum tunneling, where for longer s tunneling electrons reach only the surface contamination layer on non-metallic BiO top-surface layer, whereas for shorter s tunneling electrons penetrate also deeper lying CuO layers reflecting their superconducting properties. The dependence of a on s is evaluated. This result allows to understand better the non-vacuum scanning tunneling microscopy imaging: by adjusting properly the tip—sample distance one can select suitable local density of states contributing dominantly to the scanning tunneling microscopy images taken on BSCCO." @default.
- W790732848 created "2016-06-24" @default.
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- W790732848 date "1997-03-01" @default.
- W790732848 modified "2023-09-26" @default.
- W790732848 title "Scanning Tunneling Spectroscopy Sensitive to Layer Structure of BSCCO" @default.
- W790732848 doi "https://doi.org/10.12693/aphyspola.91.597" @default.
- W790732848 hasPublicationYear "1997" @default.
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