Differently prepared surfaces of quasicrystalline i-Al-Pd-Mn are analyzed using angle-resolved photoemission in the X-ray and ultraviolet range of photon energies. Depending on the preparation, we find both surfaces with crystalline structure and metallic character, and surfaces with quasicrystalline structural fingerprints and a suppressed density of states at the Fermi level, compatible with a pseudogap.
Henrik Moodysson Rønnow, Markus Scholz
Joël Mesot, Zoran Ristic, Marco Caputo, Zheng Wang, Anna Zakharova