AVS 46th International Symposium
    Surface Science Division Wednesday Sessions
       Session SS1-WeM

Paper SS1-WeM10
Dislocations, Phason Defects, and Domain Walls in a One-dimensional Quasiperiodic Superstructure of a Metallic Thin Film

Wednesday, October 27, 1999, 11:20 am, Room 606

Session: Surface Structure
Presenter: C.K. Shih, University of Texas, Austin
Authors: Ph. Ebert, Forschungszentrum J@um u@lich, Germany
K.-J. Chao, University of Texas, Austin
Q. Niu, University of Texas, Austin
C.K. Shih, University of Texas, Austin
Correspondent: Click to Email
We investigated disorder and structural defects in a one-dimensional quasiperiodic superstructure of a thin Ag film on GaAs(110) surfaces by scanning tunneling microscopy. The superstructure forms sequences with long and short separations exhibiting a self-similarity. We demonstrate that the modulation can be described best with a Fibonacci sequence and deviations are due to structural defects. We identify dislocations, phason defects, and domain walls. The static stress field of dislocations is found to be a source of phason defects.