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2021-04-10
11:28
OpenAccess [FZJ-2021-01626] Journal Article
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Revealing the Absolute Direction of the Dzyaloshinskii-Moriya Interaction in Prototypical Weak Ferromagnets by Polarized Neutrons
Polarized neutron diffraction (PND) is a powerful technique to distinguish a weak magnetic contribution from the total scattering intensity. It can provide a detailed insight into the microscopic spin ordering at the unit cell level, but also into the mesoscopic magnetic ordering, like different types of domain populations. [...]
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2021-04-10
11:28
OpenAccess [FZJ-2021-01551] Journal Article
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Grazing Incidence Small-Angle Neutron Scattering: Background Determination and Optimization for Soft Matter Samples
Applied Sciences 11(7), 3085 - () [10.3390/app11073085]
Grazing incidence small-angle neutron scattering (GISANS) provides access to interfacial properties, e.g., in soft matter on polymers adsorbed at a solid substrate. Simulations in the frame of the distorted wave Born approximation using the BornAgain software allow to understand and quantify the scattering pattern above and below the sample horizon, in reflection and transmission, respectively. [...]
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2021-03-27
11:28
OpenAccess [FZJ-2021-01527] Journal Article

Numerically stable form factor of any polygon and polyhedron
Coordinate-free expressions for the form factors of arbitrary polygons and polyhedra are derived using the divergence theorem and Stokes's theorem. Apparent singularities, all removable, are discussed in detail. [...]
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2021-03-13
11:28
OpenAccess [FZJ-2020-01784] Journal Article
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Performance of a Position Sensitive Neutron Scintillation Detector based on Silicon Photomultipliers
In recent years, the price increase of 3He has triggered the search for alternative neutron detectors. One of the viable options is a scintillation based neutron detector. [...]
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2021-03-12
09:21
OpenAccess [FZJ-2020-04504] Journal Article
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Tuning the Co/Sr stoichiometry of SrCoO$_{2.5}$ thin films by RHEED assisted MBEgrowth
Strontium cobaltite (SrCoO2.5+δ, SCO) is a fascinating material because of its topotactic structural phase transition caused by a change in oxygen stoichiometry. In the brownmillerite phase (δ = 0) it is an insulating antiferromagnet whereas in the perovskite phase (δ = 0.5) it is a conducting ferromagnet. [...]

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2021-03-12
09:21
OpenAccess [FZJ-2020-00210] Journal Article
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BornAgain: software for simulating and fitting grazing-incidence small-angle scattering
BornAgain is a free and open-source multi-platform software framework for simulating and fitting X-ray and neutron reflectometry, off-specular scattering, and grazing-incidence small-angle scattering (GISAS). This paper concentrates on GISAS. [...]
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2021-01-22
11:29
OpenAccess [FZJ-2020-02316] Journal Article
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Polymorphic phase transition in liquid and supercritical carbon dioxide
We present experiments on molecular density fluctuations in liquid and supercritical (SC) CO2 using small-angle neutron scattering. Thermal density fluctuations in SC-CO2 determine susceptibility and correlation length identifying the Widom line at their maxima. [...]

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2021-01-20
11:29
OpenAccess [FZJ-2020-05240] Journal Article
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Self-Similar Dynamics of Large Polymer Rings: A Neutron Spin Echo Study
This work clarifies the self-similar dynamics of large polymer rings using pulsed-field gradient nuclear magnetic resonance and neutron spin echo spectroscopy. We find center of mass diffusion taking place in three dynamic regimes starting (i) with a strongly subdiffusive domain ⟨r2(t)⟩com∼tα (0.4≤α≤0.65); (ii) a second subdiffusive region ⟨r2(t)⟩com∼t0.75 that (iii) finally crosses over to Fickian diffusion. [...]
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2021-01-16
11:29
OpenAccess [FZJ-2021-00263] Journal Article
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Raspberry structures in microgel-silica nanoparticle composite systems
Composite materials consisting of responsive microgels together with additional nanoparticles might provide new and “smart” functionality, e.g. uptake and release of nanoparticles, or special mechanical or rheological properties of a solution. [...]
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2020-12-11
11:29
OpenAccess [FZJ-2020-04970] Journal Article
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Understanding near-surface polymer dynamics by a combination of grazing-incidence neutron scattering and virtual experiments
Neutron spin-echo spectroscopy is a unique experimental method for the investigation of polymer dynamics. The combination of neutron spin-echo spectroscopy with grazing-incidence geometry (GINSES) opens the possibility to probe the dynamics of soft-matter materials in the vicinity of the solid substrate in the time range up to 100 ns. [...]
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