Description
Organizers: Z. Salman, E. Morenzoni, C. Niedermayer
Claude Ederer
(ETH Zurich)
9/19/13, 9:30 AM
invited talk
Transition metal oxides exhibit a wealth of fascinating and potentially useful properties, such as metal-insulator transitions, multiferroic behavior, or high-temperature superconductivity. The unique electronic structure of these materials generally leads to a very strong coupling between their structural, electronic, and magnetic properties. We are using first principles electronic...
Dr
Claudia Cancellieri
(PSI, SLS, Villigen)
9/19/13, 10:00 AM
invited talk
At the interface between complex oxides, unexpected electronic properties different from those of the constituent bulk materials can arise. A particularly interesting example is the appearance of 2-dimensional conductivity at the interface of the band insulators LaAlO3 (LAO) and SrTiO3 (STO) [1–3] above a critical LAO thickness of 4 unit cells (u.c.) [4].
A very recent related heterostructure...
Mr
Saikat Das
(Department of Physics and Fribourg Center for Nanomaterials, University of Fribourg, Chemin du Musée 3, CH-1700 Fribourg, Switzerland)
9/19/13, 10:30 AM
invited talk
We studied the interplay between superconductivity and magnetism in La2-xSrxCuO4 (LSCO)/La0.67Ca0.33MnO3 (LCMO) superlattices (SLs). By varying the Sr content and thus the hole doping in the cuprate layers, three SLs (x=0.0, 0.15 0.30) have been prepared using pulsed laser deposition. Upon Sr doping, the cuprate layers evolve from the insulating parent compound with an AF order of the Cu...
Dr
Christof Schneider
(PSI)
9/19/13, 11:05 AM
invited talk
Materials featuring the co-existence of coupled magnetic and ferroelectric order allow the switching of magnetic moments by an electric field and vice versa. Experimentally, only a few multiferroic materials are known to be ferromagnetic, with the large majority being antiferromagnetically ordered. We studied thin films of orthorhombic LuMnO3, a material which is known to exhibit...
Ms
Jakoba Heidler
(Paul Scherrer Institut, SLS, SYN)
9/19/13, 11:35 AM
invited talk
Multiferroic composites are promising candidates amongst the strategies to achieve electric field control of magnetism. In compounds consisting of ferromagnetic and ferroelectric (FE) layers strain can couple the FE phase via the piezoelectric effect to the magnetic phase employing magnetostriction.
[Pb(Mg1/3Nb2/3)O3](1-x)-[PbTiO3]x (PMN-PT) is a relaxor FE with strong piezoelectric...
Dr
Martin Mansson
(Laboratory for Quantum Magnetism (LQM), EPF Lausanne)
9/19/13, 11:50 AM
invited talk
Solid state diffusion is a very complex mechanism and, up until recently, studies of such properties have mainly been conducted by macroscopic methods that do not yield true material properties. This has been a major problem for materials development regarding e.g. Li-ion batteries where the basic operational principle is based on diffusion of Li-ions. Although the microscopic diffusion...
Dr
Erwin Hueger
(TU-Clausthal)
9/19/13, 2:30 PM
invited talk
The talk presents an approach to use neutron reflectometry (NR) to measure non-destructively lithium transport through nanometer thin layers of, e.g., relevant electrochemical materials. Such experiments are interesting for research on nanostructured electrode materials to understand and improve high energy density lithium batteries. Beside the important role of Li diffusion for the insertion...
Dr
Laura Nuccio
(University of Fribourg)
9/19/13, 3:00 PM
invited talk
One future avenue that may expand the rapidly growing spintronic technology is to take advantage of the long spin coherence time and of the flexibility of organic semiconductors [1]. However, advancements in understanding the behaviour of hybrid organic/inorganic spintronic devices have been slowed down by the lack of experimental techniques able to directly measure the polarization of...
Dr
Jan Gui-Hyon Dreiser
(Ecole Polytechnique Federale de Lausanne and Paul Scherrer Institut)
9/19/13, 3:30 PM
invited talk
Single-Ion Magnets (SIMs) [1-3] contain a single transition metal or rare-earth ion embedded in an organic ligand. In contrast to many other mononuclear molecular magnets, SIMs exhibit long magnetization relaxation times rendering them good candidates for future molecular spintronics or information processing applications. In order to exploit their properties they should be organized and...
Alin Velea
(Paul Scherrer Institut)
9/19/13, 4:05 PM
invited talk
Phase change materials (PCM) are promising substitutes for existing flash memories which have almost reached their miniaturization limit. The PCM memory storage is based on modification of optical and electrical properties at the transition from an amorphous to a crystalline state. Here, we report on single and bi-layer thin films of GeTe, SnSe and GaSb prepared by pulsed laser deposition on...
Dr
Vladimir Strocov
(Swiss Light Source, Paul Scherrer Insitute, Switzerland)
9/19/13, 4:20 PM
invited talk
A fundamental benefit soft-X-ray ARPES (SX-ARPES) in the energy range around 1 keV is the photoelectron escape depth increasing by a factor of 3-5 compared to the conventional VUV-ARPES. Furthermore, this region covers the 2p and 3p core levels of the transition and rare earth metals, respectively, which brings another benefit of the elemental and valence-state specificity achieved through...
Mrs
Mercedes Hannelore Rittmann-Frank
(Laboratoire de Spectroscopie Ultrarapide, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland)
9/19/13, 4:35 PM
invited talk
Electron migration and surface trapping are crucial in applications such as photocatalysis and solar energy conversion. Indeed for the former, the migration of charge carriers to the surface, where they can react with species adsorbed onto it, is the most important step.
To address the issue of charge migration, we performed ps time resolved X-ray absorption spectroscopy at the Ti K-edge on...
