| AVS 57th International Symposium & Exhibition | |
| Applied Surface Science | Tuesday Sessions |
| Session AS-TuM |
| Session: | Electron Spectroscopies |
| Presenter: | K. Fukutani, University of Nebraska-Lincoln |
| Authors: | K. Fukutani, University of Nebraska-Lincoln N. Lozova, Louisiana State University S.M. Zuber, University of Wroclaw, Poland N. Wu, University of Nebraska - Lincoln P.A. Dowben, University of Nebraska - Lincoln P. Galiy, Ivan Franko National University of Lviv, Ukraine Y.B. Losovyj, Louisiana State University |
| Correspondent: | Click to Email |
Atomic-scale structure of the growth of a gold film on Mo (112) was investigated by means of low energy electron diffraction (LEED) and scanning tunneling microscopy (STM) up to several monolayers (ML) of gold coverage. Both LEED and STM results establish that Au grows on Mo(112) in a layer-by-layer mode, for at least the first two monolayers. A number of ordered structures are formed and both the first and second layers adopt the Mo(112) 1x1 surface structure upon completion. For some gold layers on Mo(112), notably the 1.66 monolayer 3x1 and 1.75 monolayer 4x1 gold overlayers, we find evidence of a phase transition associated with increasing disorder in gold layers with structural corrugation and anisotropic band structure. The signature of this phase transition, at temperatures in the range of 400–500 K, is a sharp decrease in the overlayer effective Debye temperature. Angle-resolved photoemission spectroscopy (ARPES) suggests coverage dependent changes in the electron-phonon coupling for gold adlayer.