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Result of the Month (ROM) March 2023
Signature of Kondo Hybridisation with an Orbital-Selective Mott Phase in 4d Ca2−xSrxRuO4ROM
Result of the Month (ROM), March 2023
Signature of Kondo Hybridisation with an Orbital-Selective Mott Phase in 4d Ca2−xSrxRuO4
The heavy fermion state with Kondo-hybridisation (KH), usually manifested in f-electron systems with lanthanide or actinide elements, was recently discovered in several 3d transition metal compounds without f-electrons. However, KH has not yet been observed in 4d/5d transition metal compounds, since more extended 4d/5d orbitals do not usually form flat bands that supply localised electrons appropriate for Kondo pairing. Here, we report a substitution- and temperature-dependent angle-resolved photoemission study on 4d Ca2−xSrxRuO4, which shows the signature of KH. We observed a spectral weight transfer in the γ-band, reminiscent of an orbital-selective Mott phase (OSMP). The Mott localised γ-band induces the KH with an itinerant β-band, resulting in spectral weight suppression around the Fermi level. Our work demonstrates the evolution of the OSMP with possible KH among 4d electrons, and thereby expands the material boundary of Kondo physics to 4d multi-orbital systems.
ARPES measurements were performed at Seoul National University (SNU) and at the MERLIN beamline (BL) 4.0.3 of the Advanced Light Source, Lawrence Berkeley National Laboratory using Scienta Omicron DA30 (SNU) and R8000 (BL 4.0.3) electron analysers with energy resolutions of 10 and 15 meV, respectively.
Scienta Omicron Newsflyer Winter 2022
Welcome to the Scienta Omicron Newsflyer for winter 2022. There is a quantum theme about this newsflyer following the award of the 2022 Nobel prize for physics to Alain Aspect, John Clauser and Anton Zeilinger. They each made ground-breaking experiments using entangled quantum states, where two particles behave like a single unit even when they are separated. Their results have cleared the way for new technology based upon quantum information. In this newsflyer, we highlight two of the projects that Scienta Omicron has been involved in which will help to fabricate, manipulate, and characterise the materials that in turn improve our ability to exploit quantum behaviours and will lead to the development of new technologies.
APS March Meeting
It is finally time for this years APS March Meeting, and of course Scienta Omicron is present! We will present two talks, held by our very own Timo Wätjen, PhD, and Susanna Eriksson, PhD.
APS March Meeting is in Las Vegas for 2023. The meeting is organised by the American Physical Society (APS) and is one of Scienta Omicron's most important events during the year. About 12 000 physicists gather for the APS meeting. The event provides a great opportunity for us to connect science with business and to meet our customers in person. This year we will join APS with a commercial booth and also have scientific talks during the week. You can read more about our talks if you click the link below.
If you are at the APS, come and meet us in booth 501 to learn more and hear about our latest developments!
Open and Closed Cycle Sample Manipulators
When aiming at high experimental energy resolution for ARPES measurement, it is crucial to achieve ultra-low sample temperatures to quench thermal broadening. This is possible with state-of-the-art cryo manipulators reaching sample temperatures from < 3.5 K and featuring up to 6 fully motorized axes for a large range of movements. The manipulators are available as open and closed cycle. Open cycle manipulators reach lower temperature specifications and are rapidly cooled down from room temperature to 10 K in 15 min. The low He consumption below 1 l/h at ultimate temperature and the possibility to operate with liquid nitrogen at higher temperatures ensure a low operating cost. Closed cycle manipulators have no He consumption providing unlimited holding time.
PEAK Slit Control
Optimal analyser settings with remote control
In photoelectron spectroscopy measurements, there is always a trade-off between signal intensity and resolution. Optimising this balance is the key to obtaining smooth and sharp spectra within the shortest time possible. For hemispherical analysers, this trade-off is controlled by the selected entrance slit and pass energy.
PEAK Slit Control replaces manual slit changes at the analyser with a motorised and software-controlled slit. With the control of all analyser settings, easy and quick optimisation of signal intensity versus resolution is possible.
Scienta Omicron is a leading innovator in Surface Science and Nanotechnology. At our technology centres in Uppsala, Sweden and Taunusstein, Germany we develop and produce high-tech instruments. Our instruments support top researchers globally and are serviced by our four regional hubs in USA, China, Japan and Germany.
We provide state of the art instruments in Electron Spectroscopy, Scanning Probe Microscopy and Thin Film Deposition. Focusing on the race for new unique materials and solutions, in areas like – smarter batteries, next generation electronics, quantum technologies, solar energy, intelligent sensors and advanced materials, Scienta Omicron enables development of tomorrow´s materials.
THE SCIENTA GROUP: One Group, Two Leading Brands
Since 1983 the combined companies, including Scienta Omicron and Scienta Envinet (former Scienta Sensor Systems and Envinet GmbH respectively) that make up the Scienta Scientific Group have been leading the development of ultra high vacuum research and analysis equipment in the fields of Surface Science, Material Physics, UHV technology and Radiation Detection, resulting in scientific breakthroughs, Nobel Prizes and outstanding industrial equipment.