| AVS 54th International Symposium | |
| Surface Science | Thursday Sessions |
| Session SS1-ThM |
| Session: | Oxide Surface Structure II |
| Presenter: | S.E. Chamberlin, University of Wisconsin - Milwaukee |
| Authors: | S.E. Chamberlin, University of Wisconsin - Milwaukee H.C. Poon, University of Wisconsin - Milwaukee D.K. Saldin, University of Wisconsin - Milwaukee C.J. Hirschmugl, University of Wisconsin - Milwaukee |
| Correspondent: | Click to Email |
Structures of polar oxide surfaces have been of great interest with several models proposed to compensate the "polar surface instability problem," including 1.) adsorption of foreign species, e.g. a hydroxylated surface, 2.) surface faceting, and 3.) metallization.1 MgO(111), the polar surface of a prototypical rocksalt structure, has been shown to maintain a 1x1 structure when annealed to low temperatures and reconstruct when heated to higher temperatures,2 and thus represents an ideal system for detailed structural analysis. Detailed surface structure for the 1x1 and progress towards a structure for the (√3 x √3)R30° reconstruction will be presented. The data have recently been obtained with a novel, low-current delay-line-detector LEED (DLD-LEED) system to minimize electron damage. An hydroxylated 1x1 surface was found to be in good agreement with photoelectron diffraction and electronic structure calculations,3 but LEED-IV and Direct Methods results for the MgO(111) (√3 x √3)R30° will be shown where the structure does not agree with previously published models.2,4
References
1 C. Noguera, J. Phys.: Condens. Matter 12, R367 (2000)
2 R. Plass, K. Egan, C. Collazo-Davila, D. Grozea, E. Landree, L.D. Marks, M. Gajdardziska-Josifovska, Phys. Rev. Lett. 81, 4891 (1998)
3 V.K. Lazarov, R. Plass, H.C. Poon, D.K. Saldin, M. Weinert, S.A. Chambers, M. Gajdardziska-Josifovska, Phys. Rev. B 71, 115434 (2005)
4 A. Subramanian, L.D. Marks, O. Warschkow, D.E. Ellis, Phys. Rev. Lett. 92, 200411 (2004)