After our recent report on the formation of a (3x1) charge-density-wave phase in the quasi-one-dimensional system Br/Pt(110) we present a detailed investigation of the c(2x2)-->(3x1) transition in the Br/Pt(110) adsorption system. This includes the atomic structure of the (3x1) phase as determined by quantitative low-energy electron diffraction (LEED) and density functional theory calculations. While in the parent c(2x2) phase with coverage Theta=1/2 ML the Br atoms occupy every second short-bridge site on the unreconstructed (1x1)-Pt(110) surface, the adatoms in the (3x1) phase at coverage Theta=2/3 ML reside in every third short-bridge and long-bridge sites. Charge densities and vertical relaxations of the Pt atoms forming the short- and long-bridge sites are different, thus yielding a modulation of both, the charge and the position of the outermost Pt atoms with a period of three nearest-neighbor spacings. For 1/2 ML
(3x1)-Br/Pt(110) structure and the charge-density-wave-assisted c(2x2) to (3x1) phase transition / Deisl C; Swamy K; Memmel N; Bertel E; Franchini C; Schneider G; Redinger J; Walter S; Hammer L; Heinz K. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - STAMPA. - 69:19(2004), pp. 1-13. [10.1103/PhysRevB.69.195405]
(3x1)-Br/Pt(110) structure and the charge-density-wave-assisted c(2x2) to (3x1) phase transition
Franchini CMembro del Collaboration Group
;
2004
Abstract
After our recent report on the formation of a (3x1) charge-density-wave phase in the quasi-one-dimensional system Br/Pt(110) we present a detailed investigation of the c(2x2)-->(3x1) transition in the Br/Pt(110) adsorption system. This includes the atomic structure of the (3x1) phase as determined by quantitative low-energy electron diffraction (LEED) and density functional theory calculations. While in the parent c(2x2) phase with coverage Theta=1/2 ML the Br atoms occupy every second short-bridge site on the unreconstructed (1x1)-Pt(110) surface, the adatoms in the (3x1) phase at coverage Theta=2/3 ML reside in every third short-bridge and long-bridge sites. Charge densities and vertical relaxations of the Pt atoms forming the short- and long-bridge sites are different, thus yielding a modulation of both, the charge and the position of the outermost Pt atoms with a period of three nearest-neighbor spacings. For 1/2 MLI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.