Abstract
The surface geometric and electronic structure of the FeAl(110) intermetallic alloy has beeninvestigated by scanning tunnelling microscopy and angle-resolved photoemission spectroscopy(ARPES). Preferential sputtering results in depletion of Al in the surface region andsubsequent annealing promotes surface segregation of Al and gives rise to new reconstructedphases. A bulk terminated surface structure is obtained after annealing the surface to400 °C. However, an incommensurate phase develops above800 °C with a stoichiometryconsistent with an FeAl2 structure in the topmost layer. The ARPES measurements confirm the Al segregation withincreased density of states (DOS) near the Fermi level. The increased DOS is believed to bedue to hybridization between the Fe d and Al sp states. The increased intensity of the Al2p core level for the incommensurate phase also confirms the higher Al surfaceconcentration for this phase.
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