Low-temperature scanning tunneling spectroscopy on the 5-fold surface of the icosahedral AlPdMn quasicrystal

Authors: Widmer, R.; Gröning, O.; Ruffieux, P.; Gröning, P.

Source: Philosophical Magazine, Volume 86, Numbers 6-8, February-March 2006 , pp. 781-787(7)

Publisher: Taylor and Francis Ltd

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We report on scanning tunneling spectroscopy investigations at low temperature (5.3?K) on a bare 5-fold surface of an icosahedral Al 70 Pd 21 Mn 9 quasicrystal. By averaging tunneling spectra recorded over several nm 2 we could reproduce the typical line shape observed in point contact spectroscopy on oxidized surfaces. The averaged spectra show a large parabolic gap structure with a sharp dip of 20?meV FWHM at the Fermi energy. Whereas the averaged spectrum is relatively smooth and featureless, with exception of the sharp dip structure, the individual spectra show a rich structure of peaks and gaps. The distribution of the peak positions in energy shows a clear asymmetry between the occupied and the unoccupied states, in the sense that the peaks are mainly situated above the Fermi energy. The FWHM of these peaks is typically between 30?meV and 100?meV. The spectral features vary rapidly with tip position, where the spatial extent of a given peak in the spectrum is of the order of 0.5–1?nm. To the best of our knowledge, we will present for the first time LT-STS data in combination with high resolution STM images of a quasicrystalline surface to demonstrate the localization of electronic states and gaps and the asymmetry between the occupied and the unoccupied local density of states.

Document Type: Research Article

DOI: http://dx.doi.org/10.1080/14786430500253919

Affiliations: EMPA Materials Science and Technology, nanotech@surfaces, Feuerwerkerstrasse 39, CH-3602 Thun, Switzerland

Publication date: February 1, 2006

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