|About this Abstract
||Materials Science & Technology 2009
||Characterization and Modeling of Ceramic-Ceramic and Metal-Ceramic Interfaces
||Electrical Transport Properties of Metal/Complex Oxide Interfaces
||Susanne Stemmer, Junwoo Son, Bharat Jalan, Roman Engel-Herbert
|On-Site Speaker (Planned)
We will present our recent work on electrical transport in metal/complex oxide/metal heterostructures. We use Pt/SrTiO3/Pt interfaces as a model system. Coherent, epitaxial Pt films with a roughness of less than one unit cell were grown on (001) SrTiO3 single crystals and served as bottom electrodes for the electrical characterization of SrTiO3 films. We demonstrate all-epitaxial Pt/SrTiO3 heterostructures. In particular we show that epitaxial SrTiO3 tunnel barriers can be used for studies of phonon modes and traps. We also use ultrathin barriers to investigate the role of tunneling in current hysteresis and resistive switching that have been reported for many metal/complex oxide systems. We show that resonant tunneling can lead to switching. We also show the role of bulk defects in determining the leakage currents of thicker films. Finally, we present new oxide molecular beam epitaxy methods for SrTiO3 to obtain films and interfaces with improved quality.