Stabilizing Novel Ground States via Complex Oxide Heteroepitaxy

1. Yuri Suzuki, University of California-Berkeley, DMR 0604277 MAO substrate With advances in complex oxide epitaxial thin film growth, it is now possible to synthesize new materials whose ground states are unattainable in bulk form. The substrate imposes an epitaxial strain on atomically precise complex oxide thin films that give rise to functional properties not observed in the bulk. Therefore complex oxide heteroepitaxy is a promising route not only to study novel functional phenomena but also to exploit in technological applications. Stabilizing Novel Ground States via Complex Oxide Heteroepitaxy CuCr2O4 is an excellent example of how epitaxial strain enables the stabilization of an enhanced ferrimagnetic state.. Thinner films under full epitaxial strain exhibit moments on the order of 2µB/formula unit while partially relaxed films have values closer to those of the bulk. CuCr2O4 The enhanced magnetic moment can be understood in terms of a reduction in structural tetragonal distortion imposed by the substrate that increases j thereby increasing magnetization High resolution transmission electron microscopy shows excellent crystallinity and registry of film on substrate

2. Broader Impacts Yuri Suzuki, University of California-Berkeley, DMR 0604277 • High school spring internship program with local Oakland, CA high school in its sixth year • One week program including morning tutorials and training followed by afternoon hands-on sessions in the lab • Expanded program to include bioengineering and polymer engineering groups • Summer High School Apprenticeship Research Program • High school students requested to continue to work in the lab beyond the formal program dates • Summer and academic year undergraduate research assistants • Graduate student participation in a number of outreach programs (e.g., Prison University Project- San Quentin Prison, Techbridge- reaching out to inner city girls, Exploratorium)