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Research with Neutrons and Muons (NUM)

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NUM division - Publication Highlights

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Datum
11 January 2023
Guguchia et al

Tunable unconventional kagome superconductivity in charge ordered RbV3Sb5 and KV3Sb5

Unconventional superconductors often feature competing orders, small super- fluid density, and nodal electronic pairing. While unusual superconductivity has been proposed in the kagome metals AV3Sb5, key spectroscopic evidence has remained elusive. Here we utilize pressure-tuned and ultra-low temperature muon spin spectroscopy to uncover the unconventional nature of super- conductivity in RbV3Sb5 and KV3Sb5. At ambient pressure, we observed time- reversal symmetry breaking charge order below T*1≃110 K in RbV3Sb5 with an additional transition at T*2≃50 K. Remarkably ....

 

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30 December 2022
David Mannes

Further optimising car brakes

Media Releases Future Technologies

Research scientists at PSI and ANAXAM use neutrons to look inside brake callipers and identify potential ways of reducing CO2 emissions.

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19 December 2022
HIPA

A two-part upgrade for the proton accelerator

Large Research Facilities Medical Science Particle physics Research with muons Radiopharmacy

A two-part upgrade is planned for HIPA from 2025 to 2028. Preparations are already under way.

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28 November 2022
Crivelli and Prokscha

Making sense of the muon’s misdemeanours

An exotic atom called muonium could explain why muons won’t stick to the rules, believe researchers using the Swiss Muon Source at Paul Scherrer Institute PSI.

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21 November 2022
Upgraded pixel detector back in action at CERN

Upgraded pixel detector back in action at CERN

Built at Paul Scherrer Institute, the detector forms the heart of the CMS experiment. It is producing data again following an upgrade during the LHC shutdown.

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21 November 2022
Simutis et al

Single-domain stripe order in a high-temperature superconductor

The coupling of spin, charge and lattice degrees of freedom results in the emergence of novel states of matter across many classes of strongly correlated electron materials. A model example is unconventional superconductivity, which is widely believed to arise from the coupling of electrons via spin excitations. In cuprate high-temperature superconductors, the interplay of charge and spin degrees of freedom is also reflected in a zoo of charge and spin- density wave orders that are intertwined with superconductivity ...

 

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16 November 2022
Khasanov JAP

Perspective on muon-spin rotation/relaxation under hydrostatic pressure

Pressure, together with temperature, electric, and magnetic fields, alters the system and allows for the investigation of the fundamental prop- erties of matter. Under applied pressure, the interatomic distances shrink, which modifies the interactions between atoms and may lead to the appearance of new (sometimes exotic) physical properties, such as pressure-induced phase transitions; quantum critical points; new structural, magnetic, and/or superconducting states; and changes of the temperature evolution and symmetry of the order parameters...

 

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24 October 2022
WorldSkills PSI-Elektroniker Mario Liechti

Silver Medal in Electronics for Mario Liechti

Miscellaneous

PSI electronics technician Mario Liechti comes in second place at the world championships for non-academic professions.

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19 October 2022
Shen et al

Emergence of spinons in layered trimer iridate Ba4Ir3O10

Spinons are well-known as the elementary excitations of one-dimensional antiferromagnetic chains, but means to realize spinons in higher dimensions is the subject of intense research. Here, we use resonant x-ray scattering to study the layered trimer iridate Ba4Ir3O10, which shows no magnetic order down to 0.2 K. An emergent one-dimensional spinon continuum is observed that can be well-described by XXZ spin-1/2 chains with magnetic exchange of ∼55 meV and a small Ising-like anisotropy. With 2% isovalent Sr doping ...

 

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PSI Scientific Reports

Archive 2006-2012. The Scientific Reports – containing accounts of research topics from all the different areas – provide an impression of the variety of subjects researched at PSI.

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