The PSI Center for Neutron and Muon Sciences uses neutrons and muons to explore and understand matter and materials.
Lab News & Scientific Highlights
Origin of the Suppression of Magnetic Order in MnSi under Hydrostatic Pressure
We experimentally study the evolution of the magnetic moment 𝑚 and exchange interaction 𝐽 as a function of hydrostatic pressure in the zero-field helimagnetic phase of the strongly correlated electron system MnSi. The suppression of magnetic order at ≈1.5 GPa is shown to arise from the 𝐽 collapse and not from a quantum fluctuations induced reduction of 𝑚. Our work provides benchmarks ...
Operando phase mapping in multi-material laser powder bed fusion
Additive manufacturing (AM) or “3D printing” of metals, which builds structure layer by layer, has revolutionized the production of intricate 3D designs. Among its techniques, laser powder bed fusion (PBF-LB) excels in creating metallic parts with intricate designs and high precision. This process can combine different metals into innovative multi-material components with tailored properties, with regards to e.g., strength and thermal conductivity, surpassing the capabilities of single-material designs. However, ....
Continuum Excitations in a Spin Supersolid on a Triangular Lattice
Magnetic, thermodynamic, neutron diffraction and inelastic neutron scattering are used to study spin correlations in the easy-axis XXZ triangular lattice magnet K2Co(SeO3)2. Despite the presence of quasi-2D “supersolid” magnetic order, the low-energy excitation spectrum contains no sharp modes and is instead a broad and structured multiparticle continuum. Applying a weak magnetic field ...
Reentrant multiple-q magnetic order and a “spin meta-cholesteric” phase in Sr3Fe2O7
Topologically nontrivial magnetic structures such as skyrmion lattices are well known in materials lacking lattice inversion symmetry, where antisymmetric exchange interactions are allowed. Only recently, topological multi-q magnetic textures that spontaneously break the chiral symmetry, for example, three-dimensional hedgehog lattices, were discovered in centrosymmetric compounds, where they are instead driven by frustrated interactions. Here we show that ...
Ferromagnetic quantum critical point protected by nonsymmorphic symmetry in a Kondo metal
Quantum critical points (QCPs), zero-temperature phase transitions, are win- dows to fundamental quantum-mechanical phenomena associated with universal behaviour. Magnetic QCPs have been extensively investigated in the vicinity of antiferromagnetic order. However, QCPs are rare in metallic ferromagnets due to the coupling of the order parameter to electronic soft modes. Recently, antisymmetric spin-orbit coupling in noncentrosymmetric systems was suggested to protect ferromagnetic QCPs. Nonetheless, multiple centrosymmetric materials ...
The Zuoz school’s 26th edition
26th Zuoz Summer School on particle physics took place at the Lyceum Alpinum with close to 100 participants.
Our Facilities
Recent CNM publications
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Lieberman B, Dahbi SE, Crivellin A, Stevenson F, Tripathi N, Kumar M, et al.
Trials factor for semi-supervised NN classifiers in searches for narrow resonances at the LHC
SciPost Physics Core. 2024; 7(4): 073 (22 pp.). https://doi.org/10.21468/SciPostPhysCore.7.4.073
DORA PSI -
Hayrapetyan A, Tumasyan A, Adam W, Andrejkovic JW, Bergauer T, Chatterjee S, et al.
Search for production of a single vectorlike quark decaying to tH or tZ in the all-hadronic final state in pp collisions at √S = 13 TeV
Physical Review D: Particles and fields. 2024; 110(7): 072012. https://doi.org/10.1103/PhysRevD.110.072012
DORA PSI -
Hayrapetyan A, Tumasyan A, Adam W, Andrejkovic JW, Bergauer T, Chatterjee S, et al.
Search for soft unclustered energy patterns in proton-proton collisions at 13 TeV
Physical Review Letters. 2024; 133(19): 191902 (19 pp.). https://doi.org/10.1103/PhysRevLett.133.191902
DORA PSI