Pseudomorphic growth of a single element quasiperiodic ultrathin film on a quasicrystal substrate |
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Authors: | Ledieu J Hoeft J T Reid D E Smerdon J A Diehl R D Lograsso T A Ross A R McGrath R |
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Institution: | Surface Science Research Centre, The University of Liverpool, Liverpool L69 3BX, United Kingdom. |
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Abstract: | An ultrathin film with a periodic interlayer spacing was grown by the deposition of Cu atoms on the fivefold surface of the icosahedral Al70Pd21Mn9 quasicrystal. For coverages from 5 to 25 monolayers, a distinctive quasiperiodic low-energy electron diffraction pattern is observed. Scanning tunneling microscopy images show that the in-plane structure comprises rows having separations of S=4.5+/-0.2 A and L=7.3+/-0.3 A, whose ratio equals tau=1.618... within experimental error. The sequences of such row separations form segments of terms of the Fibonacci sequence, indicative of the formation of a pseudomorphic Cu film. |
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