A5027056029- Physics of Superconductivity and Magnetism
- Rare-earth and actinide compounds
- Advanced Condensed Matter Physics
- Magnetic properties of thin films
- Nuclear Physics and Applications
- Iron-based superconductors research
- Superconductivity in MgB2 and Alloys
- Magnetic and transport properties of perovskites and related materials
- Magnetic Properties of Alloys
- High-pressure geophysics and materials
- Atomic and Subatomic Physics Research
- Theoretical and Computational Physics
- Magnetic Properties and Applications
- Quantum, superfluid, helium dynamics
- Microstructure and mechanical properties
- Metallic Glasses and Amorphous Alloys
- Superconducting Materials and Applications
- Characterization and Applications of Magnetic Nanoparticles
- Geomagnetism and Paleomagnetism Studies
- Radiation Detection and Scintillator Technologies
- Cold Atom Physics and Bose-Einstein Condensates
- Boron and Carbon Nanomaterials Research
- Liquid Crystal Research Advancements
- Surfactants and Colloidal Systems
- Hydrogels: synthesis, properties, applications
Institut Laue-Langevin
2016-2025
Adelphi Technology (United States)
2020
Kyoto University
2020
Stanford University
2020
University of Vienna
2020
Technical University of Munich
2020
Institut Langevin
2004-2014
Bielefeld University
2004
Technische Universität Berlin
2004
CEA Grenoble
2002
The D33 small-angle neutron scattering (SANS) instrument at the Institut Laue–Langevin (ILL) is most recent SANS to be built ILL. In a project beginning in 2005 and lasting seven years, concept has been developed, designed, manufactured installed. was commissioned with neutrons during second half of 2012, fully entering ILL user programme 2013. scientific case required that should provide wide dynamic range measured vector magnitude q , flexibility regard resolution, provision polarized 3 He...
Magnetic frustration in a chiral magnet stabilizes new disordered skyrmion phase over an extended temperature region.
The present contribution presents the single-step preparation and characterization of poly(N-isopropyl acrylamide)-co-polystyrene core−shell microgels with varying polystyrene content. swelling behavior particles is investigated using dynamic light scattering differs significantly from acrylamide) homopolymer particles. lower critical solution temperature found to be shifted temperatures upon increasing content structure revealed by means small angle neutron (SANS) method contrast variation....
Apolar organic suspensions of rodlike cellulose whiskers modified by a surfactant are investigated small angle neutron scattering. Guinier and Porod analyses performed to characterize the increase cross-sectional radius gyration observed between aqueous whiskers. In addition, comparison with theoretical curves for fibers homogeneous rectangular cross sections finally leads typical dimensions ca. 120 × 210 Å2 in solutions while those water have 88 180 sizes. It is concluded that coated layer...
The calculation of neutron reflectivity from raw time-of-flight data including instrumental corrections and an improved resolution is presented. theoretical calculations are compared with experimental measured on the vertical sample plane reflectometer D17 horizontal FIGARO at Institut Laue–Langevin (ILL), Grenoble, France. This article comprises mathematical body data-reduction software COSMOS which used FIGARO.
Magnetic skyrmions are vortex-like topological spin textures often observed in structurally chiral magnets with Dzyaloshinskii-Moriya interaction. Among them, Co-Zn-Mn alloys a $\beta$-Mn-type structure host above room temperature. In this system, it has recently been found that persist over wide temperature and magnetic field region as long-lived metastable state, the skyrmion lattice transforms from triangular to square one. To obtain perspective on magnetism clarify how various properties...
We present neutron scattering from the flux line lattice (FLL) in MgB2. Between 0.5 and 0.9 T FLL undergoes a 30 degrees reorientation, simultaneously scattered intensity falls sharply consistent with weaker superconducting pi band being suppressed increasing field. speculate that sigma bands favor different orientations, reorientation is driven by suppression of band. When c axis crystal rotated 45 to applied field penetration depth anisotropy could be measured, rises both as function temperature.
Understanding the mechanism and symmetry of electron pairing in iron-based superconductors represents an important challenge condensed matter physics [1-3]. The observation magnetic flux lines - "vortices" a superconductor can contribute to this issue, because spatial variation field reflects pairing. Unlike many other iron pnictides, our KFe2As2 crystals have very weak vortex pinning, allowing small-angle-neutron-scattering (SANS) observations intrinsic lattice (VL). We observe nearly...
We present data from small angle neutron scattering (SANS) on the polyelectrolyte side chain liquid crystalline phases of porcine stomach mucin. There is a polydomain nematic phase at concentrations above point brush overlap. Also, proteoglycans were seen to orient under influence magnetic field below which brushes do not extensively The can be used investigate nature entanglement coupling between molecules. structure factor peak scales as c1/3 across complete concentration range, implying...
The order of the vortex state in La1.9Sr0.1CuO4 is probed using muon-spin rotation and small-angle neutron scattering. A transition from a Bragg glass to observed, where latter composed disordered lines. In vicinity microscopic behavior reflects delicate interplay thermally induced pinning-induced disorder.
D33 will be a third small-angle neutron scattering (SANS) instrument at the Institut Laue Langevin (ILL). Modern trends in materials science, physics and particular nano-structured require that should provide both high resolution wide dynamic range of measured vector, q. In 'monochromatic' mode velocity selector flexible system inter-collimation apertures define beam. A double chopper enable 'time-of-flight' (TOF) operation allowing an enhanced q-range (qmax/qmin) wavelength resolution. Two...
We present small-angle neutron scattering (SANS) and Bitter decoration studies of the superconducting vortices in Ba(Fe$_{0.93}$Co$_{0.07}$)$_2$As$_2$}. A highly disordered vortex configuration is observed at all measured fields, attributed to strong pinning. This conclusion supported by absence a Meissner rim images obtained close sample edge. The field dependence magnitude SANS vector indicates lattice domains (distorted) hexagonal symmetry, consistent with which show primarily 6-fold...
Measurements of a well-characterised standard sample can verify the performance an instrument. Typically, small-angle neutron scattering instruments are used to investigate wide range samples and may often be in number configurations. Appropriate useful test different aspects hardware as well that data reduction analysis software. on with intrinsic characteristics designs round robin not only better characterise for wider conditions but also, perhaps more importantly, reveal limits current...
Despite intense studies the exact nature of order parameter in superconducting Sr2RuO4 remains unresolved. We have used small-angle neutron scattering to study vortex lattice with field applied close basal plane, taking advantage transverse magnetization. measured intrinsic anisotropy between c axis and Ru-O plane (~60), which greatly exceeds upper critical (~20). Our result imposes significant constraints on possible models triplet pairing raises questions concerning direction zero spin...
We report small-angle neutron scattering studies of the lacunar spinel GaV$_4$S$_8$, which reveal long-wavelength magnetic states to be cycloidally modulated. This provides direct support for formation N\'eel-type skyrmions recently claimed exist in this compound. In striking contrast with all other bulk skyrmion host materials, upon cooling modulated transform into a ferromagnetic state. These results indicate including state, gain their stability from thermal fluctuations, while at lower...
We report on neutron scattering measurements the vortex lattice of noncentrosymmetric superconductor BiPd. observe existence intermediate mixed state, a region where Meissner and phases coexist, which is feature low <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mi>κ</a:mi></a:math> type-II superconductors. Following this, we obtain an estimate value <b:math xmlns:b="http://www.w3.org/1998/Math/MathML"><b:mi>κ</b:mi></b:math> using extended London model. Finally, find that...
We report the engineering of spin-hedgehog crystals in thin films chiral magnet MnGe by tailoring magnetic anisotropy. As evidenced neutron scattering on with different thicknesses and varying a field, we can realize continuously deformable crystals, each which is described as superposition state set three spin spirals (a triple-$\mathbit{q}$ state). The directions propagation vectors $\mathbit{q}$ vary systematically, gathering from orthogonal $\ensuremath{\langle}100\ensuremath{\rangle}$...
The magnetic system of the Mn$_{1-x}$Fe$_{x}$Ge solid solution is ordered in a spiral spin structure whole concentration range $x \in [0 \div 1]$. close inspection small-angle neutron scattering data reveals quantum phase transition from long-range (LRO) to short (SRO) helical upon increase Fe-concentration at [0.25 0.4]$. SRO identified as Lorentzian contribution, while LRO associated with Gaussian contribution into profile function. scenario $x$ driving parameter similar thermal pure MnGe....
Superconductors usually display either type-I or type-II superconductivity and the coexistence of these two types in same material, for example at different temperatures is rare nature. We employed muon spin rotation (muSR) technique to unveil superconducting phase diagram dodecaboride ZrB12 obtained clear evidence both characteristics. Most importantly, we found a region showing unusual behavior where mutually exclusive muSR signatures coexist. reproduced that theoretical modeling required...