| AVS 60th International Symposium and Exhibition | |
| Magnetic Interfaces and Nanostructures | Monday Sessions |
| Session MI+EM+MG-MoA |
| Session: | Frontiers of Complex Oxides |
| Presenter: | Y. Du, Pacific Northwest National Laboratory |
| Authors: | Y. Du, Pacific Northwest National Laboratory H. Zhang, Pacific Northwest National Laboratory R.J. Colby, Pacific Northwest National Laboratory V. Shutthanandan, Pacific Northwest National Laboratory S.A. Chambers, Pacific Northwest National Laboratory |
| Correspondent: | Click to Email |
Complex oxides with the perovskite structure exhibit a range of interesting electronic, magnetic, and optical properties. Material synthesis of those structures in thin-film form is of fundamental importance to realize their full potential. SrCrO3 was first reported to be a paramagnetic metallic oxide with a cubic structure, but the property measurements thereafter have been controversial. Almost all SrCrO3 structures have been synthesized through higher pressure and high temperature conditions and no epitaxial thin-film form has been reported to our knowledge. In this talk, we will present on the growth of epitaxial, near-stoichiometric SrCrO3 films on LaAlO3(001) substrates by molecular beam epitaxy using O2 as the oxidant. Coherently strained films are shown to grow in a layer-by-layer fashion. The cation stoichiometry was determined by XPS and RBS. In-situ XPS Cr 2p core-level spectra show that majority of the Cr cations in SrCrO3 films are in the 4+ oxidation state, although there is a small amount of Cr3+ and higher oxidation states, which could be a result of charge disproportionation. The films are appreciable oxygen deficient, as judged by XPS, RBS, and STEM. The structure and properties of SrCrO3 films will be compared to that of LaCrO3 films grown with similar conditions in the same chamber.