Periodic step arrays on the aperiodic i-Al-Pd-Mn quasicrystal surface at high temperature

TitlePeriodic step arrays on the aperiodic i-Al-Pd-Mn quasicrystal surface at high temperature
Publication TypeJournal Article
Year of Publication2010
AuthorsSato Y, Unal B, Lograsso TA, Thiel PA, Schmid AK, Duden T, Bartelt NC, McCarty KF
Journal TitlePhysical Review B
Volume81
Pages161406
Date Published04/15
ISBN Number1098-0121
Accession NumberISI:000277217200022
Keywordsalpdmn, dynamics, energy-electron diffraction, microscopy, phasons
Abstract

We have observed the configuration and motion of surface steps on the aperiodic icosahedral (i-) Al-Pd-Mn quasicrystal using low-energy electron microscopy and scanning tunneling microscopy. As the quasicrystal is cooled from high temperature, bulk vacancies migrate to the surface causing the surface to be etched. Surprisingly, this etching occurs by two types of steps with different heights moving in different directions with different velocities. The steady-state surface morphology is a uniformly spaced rhomboidal step network. This network requires that the layer stacking near the surface deviates from the bulk quasicrystal stacking.

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