Description
Organizers: JH Dil, C. Rüegg
Prof.
M. Zahid Hasan
(Princeton University)
19/09/2013, 09:30
invited talk
Topological Insulators are a new phase of electronic matter which realizes a non-quantum-Hall-like topological state in the bulk matter and unlike the quantum Hall liquids can be turned into superconductors at the bulk and/or at the interface. I will first review the basic concepts defining topological matter and experimental probes that reveal topological order. I will then present recent...
Dr
Joerg Schaefer
(University of Wuerzburg, Department of Physics)
19/09/2013, 10:00
invited talk
The spin texture of the metallic two-dimensional electron system formed by Au on Ge(111)is revealed by fully three-dimensional spin-resolved photoemission, as well as by density functional calculations. The large hexagonal Fermi surface, generated by the Au atoms, shows a significant splitting due to spin-orbit interactions. The planar components of the spin exhibit a helical character,...
Dr
Alexander Holmes
(University of Birmingham)
19/09/2013, 10:30
invited talk
BiPd is a non-centrosymmetric superconductor with a monoclinic crystal structure, a Tc of 3.8 K, and an upper critical field Bc2 (T = 0) ~ 0.7 T. The initial motivation for investigating this compound was to search for signs of mixed singlet-triplet pairing, as is permitted in systems lacking inversion symmetry. However, recent measurements by TF muSR and SANS have shown that the most striking...
Mr
Stefan Muff
(Paul Scherrer Institut)
19/09/2013, 10:45
invited talk
We identify the multi-layered compound GeBi_(4-x)Sb_xTe_7 to be a topological insulator with a freestanding Dirac point, slightly above the valence band maximum, using angle-resolved photoemission spectroscopy (ARPES) measurements. The spin polarization satisfies the time reversal symmetry of the surface states, visible in spin-resolved ARPES. For increasing Sb content in GeBi_(4-x)Sb_xTe_7 we...
Dr
Fabienne DUC
(Laboratoire National des Champs magnétiques Intenses)
19/09/2013, 11:20
invited talk
Over the past years, numerous efforts have been performed to combine high magnetic fields with X-ray and neutron scattering experiments. This combination is of significant interest as it provides new opportunities for the study of magnetic materials. In this context, pulsed magnetic fields play a central role, operating in the 30-40 T range, high above superconducting magnets.
In this talk I...
Dr
Stefano Rusponi
(Institut of Condensed Matter Physics (IPMC) - Ecole Polytechnique Fédérale de Lausanne (EPFL))
19/09/2013, 11:50
invited talk
Artificial heterostructures consisting of thin films and small clusters down to single atoms, deposited in a controlled way on surfaces or embedded in a substrate are model systems to investigate the origin of the magnetic anisotropy energy (MAE) and magnetic interactions. In particular, we want to find which combination of magnetic atom and substrate results in the highest MAE.
Good...
Robert Johann Scheuermann
(Paul Scherrer Institut)
19/09/2013, 12:10
invited talk
Since this year, the sample environment range for muon spin rotation/relaxation (µSR) at the Swiss Muon Source SµS is significantly extended by the installation of the new HAL (High-field And Low-temperature) instrument working at high magnetic fields up to 9.5 T and sample temperatures down to 20 mK, an hitherto unaccesible region in the B-T phase diagram of condensed matter research using...
Prof.
Morten Ring Eskildsen
(University of Notre Dame)
19/09/2013, 14:30
invited talk
The heavy-fermion material UPt3 can be considered as a paradigm for unconventional superconductivity. The Cooper pairs in this material are believed to form a triplet, introducing an addition degree of freedom and leading to the formation of three distinct superconducting phases. Despite intense studies the exact nature of the order parameter in this material have remained elusive.
We have...
Dr
Matej Pregelj
(Jožef Stefan Institute)
19/09/2013, 15:00
invited talk
Exotic magnetic ground states are often induced by geometrical frustration, imposing unbalance into the system and thus making it highly susceptible to all kinds of perturbations. As a result, frustrated systems may develop incommensurate magnetic long-range orders (LRO), highly disordered static spin-glass phases or even dynamic spin-liquid states. Moreover, complex magnetic LRO can induce...
Ms
Nora Hänni
(Universität Bern)
19/09/2013, 15:30
invited talk
The magnetic order in RbCoCl3 was investigated in a series of neutron scattering experiments at SINQ, PSI, on powder and single-crystal samples between 1.5 K and 300 K. RbCoCl3 is a hexagonal perovskite of CsNiCl3 type structure. It crystallizes in space group P63/mmc with lattice parameters of a=7.0003(3) Å and c=5.9959(2) Å at room temperature. Upon cooling the octahedrally coordinated...
Dr
Luca Anghinolfi
(Paul Scherrer Institute)
19/09/2013, 15:45
invited talk
Artificial spin ice comprises coupled dipolar magnetic nanoislands placed at the sites of a square or kagome planar lattice [1,2]. These particular geometries prevent the dipolar interactions to be simultaneously satisfied at the vertices where the islands meet, making the system magnetically frustrated. Microscopy techniques (magnetic force microscopy [3], photoelectron microscopy [4],...
Dr
Mark Dean
(Brookhaven National Laboratory)
19/09/2013, 16:20
invited talk
High resolution resonant inelastic x-ray scattering (RIXS) has recently emerged as a highly sensitive probe of magnetic excitations – it can even be used to measure magnetic excitations in isolated one-unit-cell-thick La2CuO4 layers [1]. This talk will describe how RIXS has provided new insights into the magnetic excitations in the high-temperature superconducting cuprates.
Photoemission and...
Andrin Caviezel
(Paul Scherrer Institut)
19/09/2013, 16:50
invited talk
Disentangling the coupled processes in the material class of strongly correlated electron materials offers great challenges due to their intricate balance of competing structural, magnetic and charge interactions. In order to advance the understanding of the underlying correlations in these materials our current efforts focus on the interaction of the atomic, electronic, and magnetic...
