Fluctuating Cu-O-Cu Bond Model for Cuprate Superconductivity
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| Event Type | Condensed Matter Physics Seminar |
|---|---|
| Date and Time | 12-Nov-2009 from 12:10 to 13:30 |
| Location | 60 St. George Street, MP 408 |
| Host | Hae-Young Kee |
Electronic structure of the SrTiO3/LaAlO3 interface revealed by resonant soft x-ray scattering
Hiroki Wadati
Department of Physics and Astronomy, University of British Columbia
Abstract:
The recent advances in oxide thin-film fabrications enabled us to obtain high-quality single-crystal oxide thin films and complex artificial hetero-junctions with an atomic-level precision. When we consider the surface or the interface of such thin films, the polarity is a big problem when each layer has a non-zero net charge. In this context, the metallic interface between two band insulators SrTiO3 (STO) and LaAlO3 (LAO) has been attracting great interest because this system is composed of non-polar STO and polar LAO. We investigated the electronic structure of the STO-LAO superlattice by resonant soft x-ray scattering [1]. By tuning photon energies to the energy of Ti 2p→3d or O 1s→2p absorption edges, one can obtain the information on the electronic structures near the Fermi level, which are composed of Ti 3d and O 2p states. From the analyses of reflectivity spectra, focusing on the (003) peak which is forbidden for our “ideal” superlattice structure, we concluded that the LaO|TiO2/SrO and the SrO|AlO2/LaO interfaces have distinct reconstructions, breaking the heterostructure symmetry. I will also introduce the experimental setup for resonant soft x-ray scattering in Canadian Light Source.
[1] H. Wadati et al., J. Appl. Phys. 106, 083705 (2009).
| Contact Info | |
|---|---|
| Name | Helen Iyer |
| iyer@physics.utoronto.ca | |
| Phone | 416-978-7135 |