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- W2092804653 abstract "Scanning tunneling microscopy measurements of the derivative of the tunnel current d I /d z , performed at different distances and on differently corrugated metal surfaces, revealed that on the smooth Cu(110) surface I and d I /d z decay with distance as expected from theory, with little effect of gap width and bias voltage on the apparent barrier height derived from these measurements. On the corrugated (1×2) reconstructed Au(110) surface d I /d z measurements show anomalously low values above the troughs of the missing rows, equivalent to local barrier heights of 0.1 eV. This behavior of the d I /d z signal, which leads to an enhanced contrast in barrier-height images recorded by modulation techniques, contradicts theoretical predictions and is inconsistent also with the local barrier heights derived from constant-current measurements at different distances. We conclude that the interpretation of d I /d z measurements in terms of local barrier heights can fail on highly corrugated surfaces." @default.
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- W2092804653 date "1992-07-01" @default.
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- W2092804653 title "Distance dependence and corrugation in barrier-height measurements on metal surfaces" @default.
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- W2092804653 doi "https://doi.org/10.1016/0304-3991(92)90319-f" @default.
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