LENS Webinar on New Directions in Instrumentation
On June 25 the League of Advanced European Neutron Source LENS organized a second webinar on "New Directions in Instrumentation". Artur Glavic (LIN) gave a presentation on "Neutrons for Magnetic Nanostructures on Surfaces: Beyond the Specular Intensity Wars", which is still available online.
Microlithography: Science and Technology
The Third Edition of "Microlithography: Science and Technology" from Taylor & Francis covers the science and engineering involved in the latest generations of microlithography.
Thermal Control of Spin Excitations in the Coupled Ising-Chain Material RbCoCl3
We have used neutron spectroscopy to investigate the spin dynamics of the quantum (S=1/2) antiferromagnetic Ising chains in RbCoCl3. The structure and magnetic interactions in this material conspire to produce two magnetic phase transitions at low temperatures, presenting an ideal opportunity for thermal control of the chain environment. The high-resolution spectra we measure ...
Les brevets comme atout
John Millard dirige le service de transfert de technologie au PSI. Le système des brevets relève donc de son domaine. Dans cet entretien, il explique comment le PSI se sert des brevets pour protéger ses connaissances et encourager davantage la collaboration avec l’industrie et d’autres centres de recherche.
Grosser Rat bewilligt 2,4 Millionen für Technologiezentrum Anaxam
Der Kanton Aargau unterstützt das Technologietransferzentrum Anaxam in Villigen für die Dauer von vier Jahren mit insgesamt 2,4 Millionen Franken. Der Grosse Rat hat am Dienstag in Spreitenbach den entsprechenden Kredit mit 124 zu 3 Stimmen bewilligt.
Phase boundary dynamics of bubble flow in a thick liquid metal layer under an applied magnetic field
We investigate argon bubble flow in liquid gallium within a container large enough to avoid wall effects. Flow with and without applied horizontal magnetic field is studied. We demonstrate the successful capture and quantification of the effects of applied magnetic field using dynamic neutron radiography and the previously developed and validated robust image processing pipeline, supported by the in silico reproduction of our experiment.
Fellow Award for Dr. Mantzaras
The prestigious Fellow Award “Fellow of The Combustion Institute” was allotted to Dr. Mantzaras for “Pioneering Experimental and Modeling Research in Hetero-/Homogeneous and Catalytic Combustion”. The combustion activities at LSM emphasize on non-intrusive laser-based measurements in a high-pressure optically accessible catalytic reactor, while the modeling activities encompass advanced multidimensional numerical simulations and theoretical work based on activation energy asymptotics.
Z3-vestigial nematic order due to superconducting fluctuations in the doped topological insulators NbxBi2Se3 and CuxBi2Se3
A state of matter with a multi-component order parameter can give rise to vestigial order. In the vestigial phase, the primary order is only partially melted, leaving a remaining symmetry breaking behind, an effect driven by strong classical or quantum fluctuations. Vestigial states due to primary spin and charge-density-wave order have been discussed in iron-based and cuprate materials. Here we present the observation of a partially melted superconductivity in which pairing fluctuations condense at a separate phase transition and form a nematic state with broken Z3, i.e., three-state Potts-model symmetry.
How to correct beam hardening effects in dual phase grating interferometry?
Researchers at the X-ray tomography group have expanded the theoretical understanding of dual phase grating interferometry with polychromatic sources. As a result, beam hardening effects can be corrected and a real space correlation function of a sample can be retrieved in dark-field imaging. These are significant steps towards application of the method for the quantitative investigation of microstructures of materials and devices using dual phase grating interferometry. The results of the work were published in Optics Express on June 12, 2020.
Mehr Rechenleistung für die Computer der Zukunft
Wissenschaftler des Paul Scherrer Instituts (PSI) und der ETH Zürich sind der Herstellung von Spintronic-Elementen auf der Basis von Prozessen, die in der CMOS-Mikrochip-Produktion eingesetzt werden, einen grossen Schritt näher gekommen. Sogenannte «Domain Wall Logic»-Schaltkreise können magnetische Informationen(Bits) direkt in der Schaltung speichern.
Eine solche Logik-in-Speichereinheit verliert keine Informationen und kann nach einem Stromausfall unmittelbar mit dem Prozess weiterfahren kann welcher zum Zeitpunkt des Stromausfalls lief. Dies ist äußerst vorteilhaft, wenn die Stromversorgung unzuverlässig ist oder ausgeschaltet wird, um Energie zu sparen - wie es bei vielen IoT-Anwendungen der Fall ist.
Das von den Professoren Gambardella und Heyderman geführte Team präsentierte einen funktionierenden Proof-of-Concept eines sog. "Adder" Schaltkreises auf Basis einer «Domain Wall Logic», der Speicher- und Logik-Vorgänge in einem einzigen Schaltkreis zusammenführt. Dies öffnet die Tür zu einer weiteren Steigerung der Rechenkapazität unserer Computer in der Zukunft.
Diffractometer stand built in collaboration with local SME
A light-weight, low-vibration diffractometer stand has been designed and produced in close collaboration with the local supplier Heinz Baumgartner AG. This component will be used in conjunction with a cryomagnet system to study quantum matter at the SwissFEL Bernina and Cristallina-Q endstations.
leadXpro développe la protéine SARS-CoV-2 M pour la campagne de recherche COVID-19
En raison de la pandémie actuelle de coronavirus, les scientifiques du monde entier travaillent ensemble à une échelle sans précédent pour en apprendre davantage sur le virus et utiliser ces connaissances pour développer des vaccins et des traitements. En collaboration avec des partenaires scientifiques et industriels tels que l'Institut Paul Scherrer, notre spin-off leadXpro a mis au point une méthode pour alimenter les initiatives de recherche et de développement avec la protéine SARS-CoV-2 M. Cette protéine M, qui est un composant important de la capsule du virus, est une cible potentielle pour les médicaments antiviraux. Nous sommes heureux d'inviter les parties intéressées qui souhaitent recevoir la protéine à contacter leadXpro.
Important information for SLS and SwissFEL users
Please find some relevant information on the following topics:
- COVID-19 call open until end of year 2020
- SLS back to 24/7 with external users on site
- Restart of user operation at SwissFEL
- Travel and safety considerations for your beamtime
- Remote access
Recherche brevetée
Les chercheurs du PSI développent des technologies innovantes, de nouveaux agents biologiques et des instruments de mesure plus précis. Cela fait progresser la science et l'économie suisse. Les meilleures idées sont protégées par des brevets et font du PSI un partenaire recherché par l'industrie.
Membrane Lifetime Estimation in a Vanadium Redox Flow Battery using an Accelerated Stress Test
A vanadium redox flow battery (VRFB) is a grid-scale energy storage device. Its energy conversion unit consists of a cell stack that comprises ion-exchange membranes to separate positive and negative electrode. The projected lifetime of a VRFB is 20 years and 7’000 charge-discharge cycles. Lifetime tests of membranes under application relevant conditions are therefore impractical, and the development of an accelerated stress test (AST) to assess the chemical stability of membranes is crucial.
Zooming in on water splitting
Perovskite oxynitride materials can act as effective photocatalysts for water splitting driven by visible light. A combined neutron and x-ray study now provides unique insight into the underlying processes at the solid–liquid interface and highlights how solar-to-hydrogen conversion can be improved.
Zooming in on water splitting
Perovskite oxynitride materials can act as effective photocatalysts for water splitting driven by visible light. A combined neutron and x-ray study now provides unique insight into the underlying processes at the solid–liquid interface and highlights how solar-to-hydrogen conversion can be improved.
A miniaturized selective laser melting device for operando X-ray diffraction studies
We report on the development of a miniaturized device for operando X-ray diffraction during laser 3D printing. Its capabilities are demonstrated by ex situ printing of complex shapes and operando X-ray diffraction experiments using Ti-6Al-4V powder.
The Mu3e collaboration grieves for Sig Martin
We lost a very good friend and an important consultant for the design and construction of the magnet for our experiment.
Influence of thermo-mechanical history on the ordering kinetics in 18 carat Au alloys
In situ high-energy synchrotron X-ray diffraction experiments in combination with electron microscopy observations reveal the influence of the thermo-mechanical history and chemical composition on the ordering kinetics during isochronal heating of 18 karat Au alloys.
Elucidation du mécanisme d’une pompe à sodium contrôlée par la lumière
Des chercheurs de l’Institut Paul Scherrer PSI ont réussi une première: réaliser des prises de vue d’une pompe à sodium en action, plus précisément d’une pompe à sodium de cellules bactériennes contrôlée par la lumière. Ces éléments de connaissance sont prometteurs pour le développement de nouvelles méthodes dans le domaine de la neurobiologie. Pour leurs analyses, les chercheurs ont utilisé le nouveau laser à rayons X à électrons libres SwissFEL.
«Switzerland Innovation Tech4Impact»: concours pour une innovation de pointe
La pandémie actuelle a également de graves répercussions sur la Suisse en tant que place économique. C'est pourquoi il est particulièrement important d'investir dans l'inno-vation dès maintenant. Dans cette optique, la Fondation «Switzerland Innovation» lance sa première mise au concours avec des partenaires renommés de l'économie suisse. Un financement sera accordé aux projets d’innovation qui s'attaquent aux problèmes les plus urgents de notre époque.
Young Scientist Award 2020
The Young Scientist Award 2020 of the European Magnetism Association (EMA) goes to Claire Donnelly for advances in the experimental characterization of spin textures and their dynamics in three dimensions with X-ray techniques.
Claire Donnelly, a former Ph.D. and postdoc at PSI in the Mesoscopic Systems Group, is currently a Leverhulme Early Career Research Fellow in the Cavendish Laboratory, University of Cambridge. She received her PhD in 2017 from the ETH Zurich for her work on hard X-ray tomography of three-dimensional magnetic structures based at the Paul Scherrer Institute. Following a postdoc at the ETH Zurich, she moved to the University of Cambridge and the Cavendish in January 2019, where she is focusing on the dynamics of three-dimensional magnetic nanostructures.
Her research focuses on three dimensional magnetic systems, which she studies using sophisticated synchorotron X-rays to determine the three-dimensional magnetic configurations, and their dynamic behaviour, at the nanoscale.
Newly discovered rapid particle growth rates may be the answer to the mystery of aerosol formation in urban smog
Aerosols, suspended particles or droplets, play a key role in Earth’s atmosphere’s energy balance. They can also result in smog formation in cities, which leads to low visibility and serious health risks for the population. A recent study published in Nature outlines a newly discovered mechanism that may play a key role in the continued survival of particles in wintertime smog.
Surface Segregation Acts as Surface Engineering for the Oxygen Evolution Reaction on Perovskite Oxides in Alkaline Media
La1–xSrxCoO3-δ perovskites are potential catalysts for the anodic reaction of alkaline water electrolyzers, i.e., the oxygen evolution reaction (OER). It is well-known that La1–xSrxCoO3−δ perovskites can easily display strontium surface segregation, but how this influences the performance of La1–xSrxCoO3−δ perovskites as anodic electrode in alkaline water electrolyzers, particularly in terms of OER activity, has not been unveiled yet. This study focuses on La0.2Sr0.8CoO3−δ, which shows relatively high activity for the OER, and reveals the influence of the preparation temperature on the amount and morphology of segregated strontium-containing islands. Thin film samples were prepared at different temperatures by using pulsed laser deposition. Those samples were then characterized with synchrotron-based X-ray photoelectron spectroscopy “as prepared” and after being immersed in ultrapure water. We found that higher preparation temperatures enhance the segregation of strontium, which is then almost quantitatively removed by washing the samples with ultrapure water. After immersion in water, the samples expose a cobalt-rich surface. Investigating the OER activity as a function of the perovskite deposition temperature, it has been found that the higher the deposition temperature (i.e., the more extended the strontium segregation), the higher the OER activity. Such an effect has been linked to the higher amount of cobalt accessible after removing the strontium segregated islands.
Surface Segregation Acts as Surface Engineering for the Oxygen Evolution Reaction on Perovskite Oxides in Alkaline Media
The temperature-dependent segregation of strontium-containing species on LSCO electrodes has been studied by means of XPS, SEM and XRD. Such surface species dissolve almost quantitatively upon immersion in water, leaving cobalt oxide, the active site of the reaction, free.
Simultaneous Nodal Superconductivity and Time-Reversal Symmetry Breaking in the Noncentrosymmetric Superconductor CaPtAs
By employing a series of experimental techniques, we provide clear evidence that CaPtAs represents a rare example of a noncentrosymmetric superconductor which simultaneously exhibits nodes in the superconducting gap and broken time-reversal symmetry (TRS) in its superconducting state (belowTc ≈ 1.5 K). Unlike in fully gapped superconductors, the magnetic penetration depth λ(T) does not saturate at low temperatures, but instead it shows a T2 dependence, characteristic of gap nodes.
First MX results of the priority COVID-19 call
The Dikic group at the Goethe University in Frankfurt am Main, Germany has published the first results following the opening of the "PRIORITY COVID-19 Call” at SLS.
The unique interplay between copper and zinc during catalytic carbon dioxide hydrogenation to methanol
The nature of high activity of Cu/ZnO catalyst in methanol synthesis remains the subject of intensive debate. Here, the authors are revisiting carbon dioxide hydrogenation mechanism using high-pressure operando techniques.
Bilan écologique des voitures: un nouvel outil web pour aider les particuliers et les chercheurs
Aide à la décision lors de l’achat d’un véhicule: des chercheurs de l’Institut Paul Scherrer ont développé un outil web baptisé Carculator qui permet de comparer en détail le bilan écologique des voitures.