| AVS 55th International Symposium & Exhibition | |
| Surface Science | Tuesday Sessions |
| Session SS-TuP |
| Session: | Surface Science Poster Session |
| Presenter: | H. Geisler, Texas State University |
| Authors: | H. Geisler, Texas State University C.A. Ventrice, Texas State University Y. Losovyj, Louisiana State University K. Chetry, University of Alabama A. Gupta, University of Alabama |
| Correspondent: | Click to Email |
The surface electronic structure of thin films of the double perovskites La2NiMnO6 and La2CoMnO6 have been measured using ultra-violet photoelectron spectroscopy at the CAMD synchrotron. Both La2NiMnO6 and La2CoMnO6 are magnetic semiconductors with magnetic transition temperatures in their bulk phases of 280 K and 226 K, respectively. The thin films were grown on SrTiO3(100) substrates using pulsed laser deposition. To prepare the clean surfaces before photoemission measurements, the samples were sputtered with 1 keV Ar ions and annealed at ~400 °C in an O2 atmosphere of 10-6 Torr. Angle-resolved photoemission measurements of both surfaces show very little dispersion of the valence emissions. Annealing the surfaces in ultra-high vacuum results in a shift of the valence features away from the Fermi level, indicating that loss of surface oxygen results in an n-type doping of these surfaces.