Nugent, P.J., Smerdon, J.A., McGrath, R., Shimoda, M., Cui, C., Tsai, A.P. and Sharma, H.R. (2011) Step-terrace morphology and reactivity to C 60 of the five-fold icosahedral Ag-In-Yb quasicrystal. Philosophical Magazine, 91 (19-21). pp. 2862-2869. ISSN 14786435
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Official URL: http://dx.doi.org/10.1080/14786435.2010.514870
The surface of the icosahedral i-Ag-In-Yb quasicrystal provides one of the first non-Al-based aperiodic surfaces that is suitable for study under ultra-high vacuum conditions. We present a scanning tunnelling microscopy (STM) study of the five-fold surface of this new quasicrystal demonstrating detailed structure of the terraces and steps. The analysis of the autocorrelation functions of STM images at opposite bias polarities and of the in-plane structure of the bulk model of i-Cd-Yb, which is isostructural to i-Ag-In-Yb, reveals that the surface terminations occur at the centres of the rhombic triacontrahedral (RTH) clusters, which are the basic building blocks of this material. The study further confirms that the unoccupied electronic states are located on Yb sites. Step edges display a Fibonacci sequence of truncated clusters, which can also be explained in terms of the model structure. Occasionally, a single terrace is found to display different structures at negative bias, whereas the same terrace shows a uniform structure at positive bias. Depositing C 60 creates a disordered overlayer on the surface with no resulting FFT or LEED patterns.
|Uncontrolled Keywords (separate with ;):||quasicrystal; Ag–In–Yb; C60 ; scanning tunnelling microscopy; autocorrelation; Fibonacci sequence; surface morphology; bias dependence|
|Subjects:||Physical sciences > Physics|
|Schools:||Faculty of Science and Technology > School of Physical Sciences and Computing|
|Deposited By:||Carmit Erez|
|Deposited On:||10 May 2013 10:26|
|Last Modified:||17 May 2016 12:41|
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