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Monday, August 11 • 14:00 - 16:00
Complex Oxides I

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Invited: Gertjan Koster

Crystal Symmetry & Properties of Low Dimensional Epitaxial Oxides; Interfaces & Superlattices

In complex oxide materials the occurrence of ferroelectric, ferromagnetic or other properties are for the most part determined by the detailed oxygen coordination of metal cations. More specifically, in the case of perovskite-type materials ABO3, where A and B are metal cations, by the BO6 octahedral orientations and rotations. At interfaces in epitaxial oxide hetero structures, for example magnetic junctions or capacitive structures, this oxygen sub-lattice is found to be different from its bulk counterpart.

I will discuss examples of oxygen sub-lattice engineering achieved by controlled thin film parameters such as digital thickness variation, polar discontinuous interfaces or the insertion of oxide buffer layers that influence the perovskite-type BO6 sub-lattice, in particular when using superlattice structures to enhance the effect in terms of measurability. The effects of such thin film parameters on the structure and properties of various model systems are subsequently studied by in situ characterization techniques, high resolution scanning transmission electron microscopy or other spectroscopic techniques (XAS, RIXS, PNR etc.). Often-encountered problems due to dead-layer effects, which normally hamper many ferromagnetic or ferroelectric functional devices, could be tackled this way. More importantly, besides improving the functionality of heterostructure devices one might expect to find surprising properties not found in the bulk.

Keywords: thin films, perovskites, transition metal oxides, crystal symmetry

Oral: Chungwei Lin
Electron Correlation in Oxygen Vacancy in SrTiO3
Co-authors: Alexander A. Demkov

Oral: Nicholas Plumb
Insights into the Electronic Structure of Surface & Interface Conducting States of SrTiO3(001)

Oral: William Rice
Persistent Optically Induced Magnetism in Oxygen-Deficient Strontium Titanate
Co-authors: Palak Ambwani, Michael Bombeck, Joseph Thompson, Gregory Haugstad, Chris Leighton, Scott Crooker

Oral: Alexandre Ramalho Silva
LaAlO3 & SrTiO3: Defects at the Surfaces & the Interface
Co-authors: Gustavo Dalpian

Oral: Ming Xie
Itinerant Electron Ferromagnetism at GdTiO3/SrTiO3/GdTiO3 Quantum Well Heterostructure
Co-authors: Allan MacDonald

Oral: Duane McCrory
Paramagnetic Defects in Variously Processed Strontium Titanate & Lanthanum Aluminate Thin Film Structures
Co-authors: Patrick Lenahan, Alexander Demkov, Andy O’Hara, Miri Choi, Agham Posadas

Session Chairs

Jeroen van den Brink

Director of the Institute for Theoretical Solid State Physics, IFW Dresden
Jeroen van den Brink is a theoretical condensed matter physicist, director at the Leibniz Institute for Solid State and Materials Research, IFW Dresden and professor at the Dresden University of Technology in Germany. Van den Brink is known for contributions to the field of strongly correlated materials, in particular for proposals on magnetic and orbital ordering and mechanisms for multiferroicity. | | He obtained a PhD from the University of... Read More →


Gertjan Koster

Associate Professor, University of Twente
After finishing a master degree on Applied Physics Dr. Ir. G. (Gertjan) Koster performed his PhD on “Artificial layered complex oxides by pulsed laser deposition“, which he defended on September 9th, 1999 advised by prof. dr. H. Rogalla. In that same year he moved to California to join the Kapitulnik-Geballe-Beasley (KGB) group at the Geballe Laboratory for Advanced Materials, Stanford University, briefly as a visiting scholar... Read More →

Monday August 11, 2014 14:00 - 16:00
Room 19A

Attendees (10)