Description
User reports
Dr
De Fanis Alberto
(European XFEL)
23/02/2016, 15:30
Oral
We combined narrow-bandwidth soft X-ray radiation, with an optical femtosecond laser (515nm, 2.4eV), to study the Auger cascade of core-excited atomic Ne in a time-resolved fashion. An X-ray pulse of 100ps duration and energy near 867eV stimulates the Ne1s->3p excitation. This core-excited state decays within its lifetime of ~2.4fs, almost instantaneous for every synchrotron and for most...
Mr
Christian Ozga
(Institute for Physics and CINSaT, University of Kassel, 34132 Kassel, Germany)
23/02/2016, 16:00
Oral
The investigation of the decay dynamics of liquids and solutions after
x-ray irradiation became accessible in recent years owing to the
tremendous progress in liquid microjet techniques. This method meets
the high vacuum conditions required for experiments using x-ray excitation
at synchrotron radiation facilities. Mainly via electron spectroscopy,
several non-local de-excitation...
Prof.
Stefan Schippers
(Justus-Liebig-Universität Gießen, I. Physikalisches Institut)
23/02/2016, 17:30
Oral
oral
Dr
Stephan Klumpp
(DESY)
23/02/2016, 18:00
Oral
The photoabsorption behavior of IH(n+) (n=2..5) molecular ions around the iodine 3d absorption edge will be presented as well as the calibration of the partial cross sections on absolute scale.
As a second topic the present status of Traptor will be discussed.
Mr
Kai Bagschik
(Institute of Nanostructure and Solid State Physics)
24/02/2016, 09:00
Oral
We present X-ray holographic microscopy (XHM) and X-ray resonant magnetic scattering (XRMS) experiments to explore, on the one hand, the thickness-driven evolution of magnetic domain patterns in wedge-shaped Co/Pt and Co/Pd multilayer samples and on the other hand the magnetic state of magnetic multilayer nanodots with a diameter of 60 nm in varying out-of-plane magnetic fields. Additionally...
Dr
Bastian Pfau
(Max-Born-Institut)
24/02/2016, 09:30
Oral
Skyrmions are winding vector fields with a characteristic spherical topology. One example for such a vector field is the winding spin structure of a magnetic bubble in thin-film material with out-of-plane magnetization. Recent theoretical investigations predict a GHz gyrotropic motion of such a topological configuration after excitation in a restoring potential, analogous to vortex gyration....
Mr
Max Rose
(PIER Fellow / DESY)
24/02/2016, 10:00
Oral
Imaging of biological samples in the water window energy range offers high chemical contrast between organic soft tissue and water. Lens based microscopes are limited by their optical elements. The coherent X-ray diffractive imaging (CXDI) method extends resolution down to the nano scale.
In order to measure samples of micrometer sizes at 25 nm resolution we used ptychographic coherent...
Dr
Matthias Kallaene
(University of Kiel)
24/02/2016, 11:00
Oral
ASPHERE III is a BMBF funded angle-, spin-, and position-resolving photoelectron spectrometer that fully exploits the unique capabilities of the variable polarization soft X-ray beamline of PETRA III.
Combining a highly efficient Scienta R4000 photoelectron analyzer with the brillant, widely tunable, and highly monochromatic photon beam of the beamline and, complementary, with the...
Ms
Giulia Manzoni
(University of Trieste, Trieste, Italy)
24/02/2016, 11:30
Oral
ZrTe5 has recently stimulated in-depth investigations aimed at clarifying its ground state electronic properties. In fact, the material has been proposed to be a 3D Dirac semimetal [1], a prototype of weak topological insulator [2] or a topological insulator in proximity of a topological phase transition [3].
Here we report a comprehensive experimental and theoretical study of both its...
Dr
Thiago Peixoto
(Universität Würzburg, Fakultät f. Physik u- Astronomie, Lstl. f. Experimentelle Physik VII)
24/02/2016, 12:00
Oral
We investigated the electronic structure of (BiSbV)2Te3 thin films by means of X-ray photoemission (XPS) and absorption (XAS) spectroscopy. This system is a three-dimensional magnetic topological insulator, recently reported
as an anomalous quantum Hall system. The films were epitaxially
grown on a Si(111) crystal and covered by a Se cap to avoid
contamination during exposition to air....
Prof.
Gerd Schoenhense
(University of Mainz, Inst fuer Physik)
24/02/2016, 12:30
Oral
The shape of the Fermi surface and the Fermi velocity vF as a function of direction in k-space are of high importance for the design of materials with tailored electronic properties. Moreover, the topology of the Fermi surface plays a crucial role in the existence of topologically non-trivial electronic states like the metallic states in the surface region of topological insulators. The novel...
Dr
Lars Lühl
(Technische Universität Berlin)
24/02/2016, 14:00
Oral
We present a scanning X-Ray Microscope, which uses a zone plate to focus the beam to a roughly 100 nm spot size onto the sample. Images are taken by scanning the sample through the focus and detecting the transmission signal with an area detector (CCD) and the fluorescence signal with a SDD detector.
X-Ray microscopy, especially in the tender energy region of several hundreds of eV to some...
Mr
Ivan Baev
(Physics Department, University of Hamburg)
24/02/2016, 14:30
Oral
The use of STJ’s as absorber material for spectroscopic Soft X-Ray
detection is very promising in terms of energy resolution and count
rate capabilities. Because of the low excitation energy of Cooper pairs
in a superconductor (few meV) three orders of magnitude more charge
carriers than in a Si-detector are produced per photon. The ultimate
resolution limit for such a detector is...
