LIN: Laboratory for Neutron and Muon Instrumentation
Through a unique mix of technical and scientific staff the Laboratory for Neutron and Muon Instrumentation (LIN) is central to the operation and development of scientific instrumentation and methods for the SINQ and UCN neutron sources as well as the SμS muon source at the Paul Scherrer Institut (PSI). These efforts enable both PSI researchers as well as the international scientific user community to carry out state-of-the-art experiments that employ neutron and muon particle beams to solve topical scientific issues in fields ranging from particle physics to solid state physics to materials science.
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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.
The League of advanced European Neutron Sources (LENS) with the participation of PSI held its second General Assembly at Institut Laue-Langevin (ILL) together with meetings of its five working groups and the LENS Executive Board. The meetings brought the consortium’s operational working groups together with the leaders of the LENS member facilities to advance priority actions for the organisation in the months to come.
PSI is entirely responsible to build the polarised neutron reflectometer ESTIA at the European Spallation Source ESS in Lund, Sweden. The lead ESTIA scientist Artur Glavic (LNS/NUM) has now simulated a virtual tour of the neutrons travelling through the instrument from the focusing neutron guide to the detector.
Using Uniaxial Stress to Probe the Relationship between Competing Superconducting States in a Cuprate with Spin-stripe Order
We report muon spin rotation and magnetic susceptibility experiments on in-plane stress effects on the static spin-stripe order and superconductivity in the cuprate system La2−xBaxCuO4 with x = 0.115. An extremely low uniaxial stress of ∼0.1 GPa induces a substantial decrease in the magnetic volume fraction and a dramatic rise in the onset of 3D superconductivity, from ∼10 to 32 K.
Here we investigate antiferromagnetic Eu5In2Sb6, a nonsymmorphic Zintl phase. Our electrical transport data show that Eu5In2Sb6 is remarkably insulating and exhibits an exceptionally large negative magnetoresistance, which is consistent with the presence of magnetic polarons. From ab initio calculations, the paramagnetic state of Eu5In2Sb6 is a topologically nontrivial semimetal within the generalized gradient approximation (GGA), whereas an insulating state with trivial topological indices is obtained using a modified Becke−Johnson potential.
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.