The PSI Center for Neutron and Muon Sciences uses neutrons and muons to explore and understand matter and materials.
Lab News & Scientific Highlights
Prof. Dr. Marc Janoschek appointed new Head of the PSI Center for Neutron and Muon Sciences (CNM)
Prof. Dr. Marc Janoschek will take over as Head of the PSI Center for Neutron and Muon Sciences (CNM) on 1 June 2025.
Spin density wave and van Hove singularity in the kagome metal CeTi3Bi4
Kagome metals with van Hove singularities near the Fermi level can host intriguing quantum phenomena such as chiral loop currents, electronic nematicity, and unconventional superconductivity. However, to our best knowledge, unconventional magnetic states driven by van Hove singularities–like spin-density waves–have not been observed experimentally in kagome metals. Here, we report ...
Superconductivity and a van Hove singularity con ned to the surface of a topological semimetal
The interplay between topology and superconductivity generated great interest in condensed matter physics. Here, we unveil an unconventional two-dimensional superconducting state in the Dirac nodal line semimetal ZrAs2 which is exclusively con ned to the top and bottom surfaces within the crystal’s ab plane.
As a remarkable consequence ...
Momentum-resolved fingerprint of Mottness in layer-dimerized Nb3Br8
Crystalline solids can become band insulators due to fully lled bands, or Mott insulators due to strong electronic correlations. While Mott insulators can theoretically occur in systems with an even number of electrons per unit cell, distinguishing them from band insulators experimentally has remained a longstanding challenge.
In this work, we present ...
Emergence of topological Hall effect from a fluctuation-based dynamic origin
The topological nature of the electronic bands or spin structure has direct manifestation in experimentally measured Hall conductivity. The extra topological (or geometrical) component to the Hall effect (THE) usually emerges due to multi-k structures, which inherently possess a finite static scalar spin chirality (SSC). Generating a THE in a single-k structure necessitates the consideration of the dynamical origin of SSC, the real material examples of such cases remain scarce to date.
In Search of New Physics: New Result from the MEG II Collaboration
On the occasion of a special seminar at the Paul Scherrer Institut (PSI) in Switzerland on 23 April 2024 the scientific collaboration of the MEG II experiment presented an important new result in the search for the decay of a positive muon into a positron and a photon. The findings, based on data collected in 2021 and 2022, are detailed in a paper published on arXiv and submitted to the journal Physical Review Letters.
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Recent CNM publications
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Chekhovsky V, Hayrapetyan A, Makarenko V, Tumasyan A, Adam W, Andrejkovic JW, et al.
Identification of low-momentum muons in the CMS detector using multivariate techniques in proton-proton collisions at √s = 13.6 TeV
Journal of Instrumentation. 2025; 20(4): P04021 (40 pp.). https://doi.org/10.1088/1748-0221/20/04/P04021
DORA PSI -
Mirzaei F, Jaiswal M, Younas D, Kaestner A, Scheidl K, Chattopadhyay B, et al.
4D imaging of frost heave and ice lens growth in silt using neutron and x-ray computed tomography
Applied Physics Letters. 2025; 126(17): 174103 (8 pp.). https://doi.org/10.1063/5.0254006
DORA PSI -
Date M, Petocchi F, Yen Y, Krieger JA, Pal B, Hasse V, et al.
Momentum-resolved fingerprint of Mottness in layer-dimerized Nb3Br8
Nature Communications. 2025; 16(1): 4037 (8 pp.). https://doi.org/10.1038/s41467-025-58885-1
DORA PSI -
Aguilar AC, Bashir A, Cobos-Martínez JJ, Courtoy A, El-Bennich B, de Florian D, et al.
Latin American Strategy Forum for Research Infrastructure (III LASF4RI Contribution): The glue that binds us all—Latin America and the Electron-Ion Collider
Brazilian Journal of Physics. 2025; 55(4): 145 (17 pp.). https://doi.org/10.1007/s13538-025-01778-x
DORA PSI