[seminar] Seminar @ Institute of Physics, Tuesday 22nd Mar 2022 at 11:00, lecture room 1st wing, and Zoom

[Damir Dominko]

Seminar @ Institute of Physics, Tuesday 22nd Mar 2022 at 11:00, lecture 
room 1st wing, and Zoom

*Resonant Inelastic X-ray Scattering Experiments at the SEXTANTS 
Beamline and Perspectives for RIXS Under Electric and Magnetic Fields**
*
*Dr. Alessandro Nicolaou
*
*Synchrotron SOLEIL, L’Orme des Merisiers, Saint-Aubin, BP 48, 91192 
Gif-sur-Yvette,France*

Resonant inelastic X-ray scattering (RIXS) is a photon-in photon-out 
technique in which the system is resonantly excited at an absorption 
edge and the scattered photons are measured in order to probe the energy 
and momentum transfer of the intrinsic excitations, such as electronic, 
magnetic or of the lattice. This spectroscopy has been subject of a 
remarkable progress in the last decades for its capability of gaining 
information of fundamental interest for correlated systems.
At the SEXTANTS beamline of the synchrotron SOLEIL, we perform RIXS 
experiments in the soft X-ray regime. After a short presentation of the 
technique, I will highlight some of the main experimental results we 
recently obtained. One example is represented by the work on 
La1-xSrxVO3, a canonical example of correlated system exhibiting a 
filling control metal-insulator transition, as well as orbital and 
antiferromagnetic orderings at low temperature. I will show how 
low-doping (x=0.1) affects the electronic structure primarily on the O 
sites, at odds with a simple Mott-Hubbard picture, and how RIXS can 
measure orbital excitations and their behavior with temperature. I will 
discuss how these results can be only partially understood by a local 
model based on crystal field theory calculations.
Finally, I will describe the capabilities of the novel MAGELEC sample 
environment, which was conceived for performing RIXS experiments under 
electric and magnetic fields in a temperature range from 400 K down to 
18 K. MAGELEC consists of sample holder equipped with 12 electrical 
contacts, which is combined with a compact quadrupolar magnet delivering 
a rotatable magnetic field up to 0.45 T. Thanks to the particular design 
of the electromagnet, the whole scattering plane is available for 
magnetic circular and linear dichroism RIXS experiments. I will show how 
this unique sample environment, accessible for external users since 
February 2020, opens new perspectives at the SEXTANTS beamline thanks to 
the possibility to tackle several kinds of open questions in the field 
of transition metal compounds beyond the accuracy obtained by the widely 
used X-ray magnetic circular dichroism and in operando conditions.

Join Zoom Meeting
https://zoom.us/j/92983064161?pwd=blhQRVkwN3krYlh0bEJKQU1MZjJjZz09
<https://zoom.us/j/92983064161?pwd=blhQRVkwN3krYlh0bEJKQU1MZjJjZz09>
Meeting ID: 929 8306 4161
Passcode: 881514

*Seminar hosts: <mailto:nsantic at ifs.hr>Neven Šantić i Damir Dominko 
<mailto:ddominko at ifs.hr>*
________________________________________________________________________________

-- 
Damir Dominko
Research associate
Institute of Physics Zagreb
Bijenicka cesta 46, 02-226
10000 Zagreb, Croatia
office: +385 1 469 8821
cell: +385958172990
e-mail:ddominko at ifs.hr
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