cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.5286/isis.e.rb1820537
title: Investigation of Multiple-q states around the Quantum Critical Point of URu2Si2 by Laue Diffraction in 40 T Pulsed Magnetic Fields II

description: URu2Si2 has been examined intensively over the decades for the rich phase diagram including superconductivity, Hidden Order and multiple magnetic phases appearing around the quantum critical point (QCP).  Despite its uniqueness, the QCP is located around a magnetic field of 35 T and neutron diffraction was impossible. In RB1710307 at MERLIN, we found that the high field phase is incommensurate spin density wave(SDW) with a multiple-q in the magnetic fields of 38-39 T. It shows the advantage of a white neutron Laue diffraction method to examine wide area of the reciprocal space, which is not possible in the ILL reactor experiment. Despite the important result obtained in the previous proposal, we need to continue the experiment to have the enough statistics to finalize the magnetic model of URu2Si2 and establish the understanding of QCP and hidden order.
DOI: 10.5286/isis.e.rb1868015
title: Na-Dynamics in Solid Ionic Conductors: 11Al2O3-Na2O and Na2Ti3O7

description: We would measure vibrational spectra as well as quasielastic neutron scattering (QENS) spectra for beta- alumina (11Al2O3-Na2O) and Na2Ti3O7. The measurement of phonon spectra in the entire Brillouin zone over the temperature range of 300-1000 K is required for characterizing the specific phonon modes relevant to the ionic conductivity and thermal expansion behavior. The measurements would help to identify the phonons which show significant changes as a function of temperature. In addition, we propose to understand the diffusion pathways and timescales by QENS. By combining the vibrational and QENS measurements (300-1000 K) with first-principles phonon calculations and temperature-dependent molecular dynamics simulations, we expect to gain deeper insights of the origin and mechanism of ionic conductivity in amorphous phase and their relationship to phonons in these compounds.
DOI: 10.5286/isis.e.rb1910488
title: Models of the [FeFe]-hydrogenase active site: high symmetry in a biologically-relevant system

description: The [FeFe]-hydrogenase enzymes are some of the best catalysts know for generating hydrogen. We have an ongoing programme to understand how their chemistry works, and to replicate the core 'active site' of the enzyme.  Building on previous work, here we will use a model with high symmetry to produce stronger signals than can be achieved using a more realistic mimic. This will help us to identify unique reactivity in our systems, and will enable us to build toward a greater understanding of the overall reaction scheme.
DOI: 10.5286/isis.e.rb1500001
title: Lithium-Methylamine: using muons to finally tell us what is going on with these polarons (rapid access)
DOI: 10.5286/isis.e.rb1510008
title: Optimising chemical structure of CO2-philic hybrid surfactants for stabilising water-in-CO2 microemulsions

description: The proposal aims to explore water-in-CO2 (w/c) microemulsions with very promising hybridCO2-philic surfactants. The surfactants have been systematically synthesised withmodifications centred on two main strategies including different levels of hydrocarbon chainbranching and surfactant headgroups. This study will provide new insight for designingeconomical and efficient hybrid surfactants with high solubilising power (high w ratio) and lowfluorine content. Therefore, it is very beneficial because it advances surfactant moleculardesign for green CO2-based technologies.
DOI: 10.5286/isis.e.rb1510140
title: Structural Investigation of Co-polymer and Comb-polymer Solid State Electrolytes for Li-batteries using SANS

description: This proposal regards studies of the structure and morphology of polymer electrolytes which can be used in Li-batteries. These electrolytes are effectively used in electric vehicles, but the ionic transport is generally considered to be too low. Knowledge about the structure in these materials can aid future design, since the dynamic properties are intrinsically dependent on the structural properties - i.e., vital input can be given on how ions are transported. Here, we will invesitgate block-copolymeric and comb-polymeric materials which self-organize in hydrophilic and hydrophobic domains, and it will be decisive to obtain knowledge about the domain sizes and organisation. Therefore, SANS measurements can be a very powerful technique.
DOI: 10.5286/isis.e.rb1520143
title: Phonon Anomalies in YMnO3 at High Temperature

description: The reported structural phase transition in YMnO3 from P63cm to P63/mmc space group occurs at 1258 ±14 K. For low temperature phase (space group P63cm) the phonon modes are found to be stable (Fig. 2) in the entire Brillouin zone. However, we find unstable phonon mode in the high temperature (space group P63/mmc) phases at M (0.5 0 0) and K (1/3 1/3 0) points. These unstable modes are highly anharmonic in nature and become stable at higher temperature due to anharmonicity. The transition from ferroeletric (space group P63cm) to paraelectric phase ((space group P63/mmc)) is expected to be driven by phonon anomalies. The low energy phonon modes up to 20 meV are expected to be most affected by the phase transitions. We propose to measure temperature dependence of low energy zone centre and zone boundary phonon modes from 300 K and 1300 K.
DOI: 10.5286/isis.e.rb1520152
title: In Search of Superionic Conductivity of Mg2+ Cations

description: The migration of cations with a charge greater than 1 has received very little attention historically, perhaps due to no commercially driven demand for the research as well as the common assumption that these processes will be highly hindered due to large interactions between the mobile ion and the lattice it passes through. It is the aim of this proposal to challenge those conceptions and confirm the first potential example of superionic conductivity of the Mg2+ ion through a crystalline lattice. It is hoped this research will stimulate others in the defect chemistry community to reconsider how multivalent ions migrate through solids, to obtain a better understanding of this phenomena.
DOI: 10.5286/isis.e.rb1520325
title: Magnetic excitations in La1.2Sr0.8NiO4 and LaSrNiO4

description: The recent exciting observations in the magnetic excitation spectra of cobalt oxides that are isostructural to the prototypical high-temperature superconducting cuprates have shown the importance to study also copper-free reference systems. Here, we would like to study the spin excitations of another copper-free reference system - highly oxidized nickelates La(2-x)Sr(x)NiO4. Although the low-doped nickelates (x &lt;= 1/2) have been very intensely studied in the past nothing is reported about the excitation spectra on the highly hole doped side of the phase diagram (x &gt;&gt; 1/2). Whereas a robust charge stripe phase occurs at lower hole-doping the role of holes and Ni2+ ions is reversed at high hole-doping. Indeed, we observe unexpected magnetic correlations at high hole-doping and need to extend our studies to a higher energy range now in order to understand these surprising findings.
DOI: 10.5286/isis.e.rb1562003
title: Characterization of traditionally made laminated iron and steel reference samples for Japanese sword production
DOI: 10.5286/isis.e.rb1600019
title: Determination of the bulk antiferromagnetic structure of monodomain (001) BiFeO3 heterostructures to uncover the exchange-bias mechanism
DOI: 10.5286/isis.e.rb1600025
title: The Effect of Core Oligosaccharide Size on the Binding of Antimicrobial Proteins to Models of the Gram-Negative Bacterial Outer Membrane
DOI: 10.5286/isis.e.rb1820264
title: Roles of magnetic anisotropy and inter site exchange interactions in the temperature dependent magnetization reversal in NdMnO3 perovskite

description: NdMnO3 exhibits A-type antiferromagnetism with TN =73 K. At 15 K, Nd sublattice orders with a (0, -Fy, 0) type ferromagnetic arrangement. Mn spin reorientation from (Ax, Fy, 0) to (Ax, -Fy, 0) occurs at 15K, and it leads to a reversal of net magnetization. We aim to understand the roles of anisotropy and exchange interactions between Nd and Mn sublattices in magnetization reversal in NdMnO3 by carrying out INS study. The calculated magnetic excitation spectra (based on linear spin-wave theory) will be compared with experimental INS data using the Merlin spectrometer with Ei = 40 meV over 100  5 K. The proposed study would reveal the spin Hamiltonian for NdMnO3. The work will be useful to develop a theory to understand the technologically-important phenomenon of magnetization reversal, and would also encourage future INS study on other magnetic materials that show magnetization reversal.
DOI: 10.5286/isis.e.rb1820387
title: Neutron scattering investigation of Lithium diffusion mechanism in the Li-ion battery material LiCoO2

description: The compound LixCoO2 has attracted lots of attention in the recent years because of its application as cathodes in Li-ion batteries.  The diffusion pathway of Li- ions within a battery material is inherently important to its capacity to charge and discharge. Knowledge of the Li ions diffusion pathways is expected to provide a vital know-how for the future battery research. The main aim of the present proposal is to find out the diffusion pathways and diffusion rates along different crystallographic directions by carrying out QENS measurements using the OSIRIS spectrometer.    The quasi-elastic neutron scattering will give the information about the diffusion of Lithium, which will reveal the information about the diffusion constant. To complete the proposed measurements at four temperatures over 300-900 K, we need 6 days of neutron beam time at the OSIRIS spectrometer.
DOI: 10.5286/isis.e.rb1820500
title: Magnetic excitations in a candidate magnetic XY analogue of graphene

description: This proposal is part of our research programme to explore the experimental manifestation of topological properties of magnetic excitations. The honeycomb ferromagnet is expected to be a magnetic analogue of graphene, where the acoustic and optic magnon branches have symmetry-protected Dirac linear touching points with characteristic dynamical structure factor singularities, not explored experimentally so far. Here we propose to reveal aspects of this physics by measuring the spin dynamics in a weakly-coupled two-dimensional XY honeycomb ferromagnet with strong spin-orbit coupling.
DOI: 10.5286/isis.e.rb1820507
title: Continuation: A Study of AuMu^+ Final States by Dia RF Resonance

description: Small-sized metal nanoparticles (NPs) are of long standing interest to both magnetism and heterogeneous catalysis. Recent muSR  studies of Au NPs encapsulated in mesoporous silica at TRIUMF showed clear evidence of a reaction of the hydrogen-like muon-electron bound state muonium (Mu) with the Au NP surfaces. Preliminary results suggest faster chemical addition for smaller NPs, consistent with an anticipated enhanced catalytic effect. We propose to measure GNPs of different sizes in order to investigate whether and how the reactivity depends on the particle size. Radio Frequency muSR is a sensitive method both to confirm the final state species and to directly measure its formation rate. The study should also reveal the magnetic nature of the surface from the RF line widths.
DOI: 10.5286/isis.e.rb1820549
title: Determination of the magnetic interactions of low-dimensional binary metal thiocyanates

description: Magnetic molecular framework materials, where the magnetic metal centres are linked together by molecules rather than single atoms, are a very exciting class of materials, as they can combine the interesting features of molecular frameworks: porosity, flexibility and modularity with useful magnetic behaviour. Thiocyanate (NCS) is particularly interesting as a linker as it is unusually effective at transmitting magnetic coupling, but very little is known about the magnetic behaviour of the simple binary metal thiocyanates. In this experiment, we will use inelastic neutron spectroscopy to measure the dynamics of the magnetic spins. This will allow us to understand the magnetic interactions in these frameworks, and so will guide our design of new, functional magnetic materials.
DOI: 10.5286/isis.e.rb1868011
title: Evaluation of Phonon Density of State (PDOS) and its correlation with thermoelectric performance in Bi2Te3/Graphite nanocomposites

description: Nanocomposites offer a promising route for enhancing thermoelectric (TE) efficiency (ZT), which depends on interrelated material properties like Seebeck Coefficient, electrical and thermal conductivity. Our recent measurements reveal 40 fold increase in ZT at 290 K in Bi2Te3/Graphite nanocomposite as compared to pristine Bi2Te3, a potential TE material around room temperature. Manipulation of phonon transport plays a significant role in reducing thermal conduction and help to separate it from electrical transport properties. Knowledge of Phonon Density of States (PDOS) is crucial to understand the role of phonon contribution to thermal conductivity. Additional interfaces in nanocomposite lead to preferential scattering of phonons and modify PDOS. Inelastic neutron scattering experiment will reveal the role of PDOS in Bi2Te3/Graphite and help us to correlate it with observed enhanced ZT.
DOI: 10.5286/isis.e.rb1900111
title: Copy of: Chipir commercial access: NVIDIA #1

description: Commercial testing
DOI: 10.5286/isis.e.rb1900113
title: Chipir commercial access: Cisco Systems, Inc. in Mar 2-5

description: Chipir commercial access: Cisco Systems, Inc.
DOI: 10.5286/isis.e.rb1910267
title: Neutron reflectometry from surface of liquid 3He/4He film on silicon wafer

description: A superfluid helium film can host a variety of exotic quantum phenomena, such as the topological BerezinskiiKosterlitzThouless transition, Rollins film flow and Third sound. Earlier, we proposed an experimental set-up based on a standard silicon wafer (RB1510035), which allowed us to observe (5 months ago) for the first time 163 Å thick 4He and 0.1% 3He/4He mixture films formed on a silicon surface, using the neutron reflectometer POLREF. In our experiment we were able to observe and study several quantum liquid effects previously observed by other methods. However, taking into account the importance of these results, and our ambition to publish it in a highly rated journal, we need to repeat these measurements to prove the reproducibility of reflectivity density profiles of superfluid He mixture film obtained in the earlier experiment.
DOI: 10.17909/t9-m29s-xg91
title: Hubble Catalog of Variables ("HCV")

description: The Hubble Catalog of Variables (HCV) is the first full, homogeneous, catalog of variable sources found in the Hubble Source Catalog (HSC), which is built out of publicly available images obtained with the WFPC2, ACS and WFC3 instruments onboard the Hubble Space Telescope. The HCV is the deepest catalog of variables available. It includes variable stars in our Galaxy and nearby galaxies, as well as transients and variable active galactic nuclei. The HCV contains 84,428 candidate variable sources (out of 3.7 million HSC sources that were searched for variability) with V &lt;= 27 mag; for 11,115 of them the variability is detected in more than one filter. The number of data points in a light curve range from 5 to 120, the time baseline ranges from under a day to over 15 years, while ~8% of variables have amplitudes in excess of 1 mag. Two catalogs are provided in this HLSP: a catalog of variables, and a catalog of objects that are "constant" within 5-sigma of their median absolute deviation (MAD). The catalog of variables lists for each source the equatorial coordinates, MatchID, GroupID, subgroup, the pipeline classification flag, the expert-validation classification flag, the number of existing instrument and filter combinations for the source, the name of the instrument and filter combination. The filter combination includes: the filter detection flag (set to "1" if variability is detected, or "0" if not), the variability quality flag, the number of measurements in the light curve, the HSC magnitude, the corrected magnitude, the MAD value, and the reduced chi^2 value. For all multi-filter variable candidates, there are extra columns for each additional instrument and filter combination, in which the source is classified as a variable candidate. The catalog of constant sources contains the sources that fall below the 5-sigma detection threshold of the HCV pipeline. These include constant sources and low-amplitude variables that are below the detection threshold. For each source, the columns show the equatorial coordinates, the MatchID, the GroupID, the subgroup, the number of instrument and filter combinations in which individual sources are observed, follwed by the name of each instrument and filter combination for which the following data are given: the number of measurements in the light curve, the HSC magnitude, the corrected magnitude, the MAD value, and the reduced chi^2 value.
DOI: 10.5286/isis.e.rb1510239
title: Dynamics of Oil Exchange in PIC Nanoemulsion - Dependence on the Systems Composition

description: The dynamics of oil exchange in oil-in-water (O/W) nanoemulsions produced spontaneously by the phase inverse concentration (PIC) method is only little known so far. In this experiment we will study this exchange dynamics by means of the stopped-flow method and mixing two otherwise identical PIC nanoemulsions that contain deuterated or hydrogenated oil. SANS is uniquely able to discern this exchange and we will study how the exchange kinetics depends on the composition of the surfactant monolayer (effect of electrostatic and steric stabilisation). The experiments will be done in a systematic fashion and by varying the chain length of the alkane we will be able to distinguish Ostwald ripening from coalescence. In summary we will be able to derive systematic correlations between the molecular compositon of the nanoemulsions and how that affects their internal exchange dynamics.
DOI: 10.5286/isis.e.rb1510247
title: Light induced spin polarisation in Ruby

description: To date, most experiments within the MuSES project have been on liquids samples at room temperature. The liquids were required to overlap the optical absorption with the muon¿s stopping profile, as the materials being investigated are strongly absorbing. This proposal is to study the photoexcited state of magneto-optically active solids with muons, notably ruby, with the intention to a) better understand the magneto-optical properties and dynamics of this material class and b) demonstrate the applicability of laser-MuSR for these kind of investigations. The major goal is to measure the magnetic state induced by circularly polarised light. Significantly if the ordering is observed, this will be the first time that photo-induced coherent electron spin relaxation has been measured in the bulk of the sample with MuSR. This would open the door to a plethora of photomagnetic possibilities.
DOI: 10.5286/isis.e.rb1510502
title: Methane hydrate formation in the presence of surfactant

description: In this proposal we wish to study in situ formation of methane hydrates in surfactant solutions. The broad aim of this research is to enable us to understand how we can influence the occurrence and rate of methane hydrate nucleation. Neutrons and NIMROD are essential for this work, as they will allow us probe the relevant length and timescales, and also to exploit H/D labelling of the methane. Surfactants are of particular interest as they can serve to inhibit the agglomeration of hydrate crystals. We are interested in studying the non-ionic surfactant hexaethylene glycol monododecyl ether, as this surfactant combines potential benefits of anti-agglomeration and thermodynamic hydrate inhibition, thus reducing the amount of additive required to prevent methane hydrate formation.
DOI: 10.5286/isis.e.rb1510616
title: Stretching elastic

description: In all mammals, tissue elasticity is conveyed by elastin. Elastin is an essential extracellular matrix protein found within arteries, skin, lungs and elastic cartilage. Elastin's responses to systole and diastole are needed to maintain and regulate blood pressure during and between heartbeats. Tropoelastin is the soluble precursor of elastin and is the most elastic biomaterial known. In solution Tropoelastin is an asymmetric molecule about 20nnm in length with a foot protubance which contains the cell interaction motif. However, little is known about how this protein may deform under shear or extension stresses. By combining SANS with in-situ flow fields, we will determine this response through the visualization of changes  in the orientation, shape and size of the protein induced by these flow fields.
DOI: 10.5286/isis.e.rb1520175
title: Morphological Stability of Organic Solar Cell Structures during Aging

description: Organic photovoltaics (OPVs) have recently surpassed 10% power conversion efficiency (PCE), a key milestone towards commercialisation. Achieving validated lifetimes beyond 10 years is equally important, yet the physical degradation of active organic layers during device operation is not yet well understood. Efficient OPVs rely on solid-state light absorbing mixtures of electron donating and accepting molecules with nanometre-scale domains. As the initial microstructure in OPVs is kinetically trapped during fabrication, thermal- and photo-induced demixing arising from prolonged operation can severely degrade PCE. We propose to use neutron reflectometry at OFFSPEC on pristine and aged OPVs using a new series of high-performance donor polymers to probe microstructural evolution and layer demixing, helping reveal design strategies for significant OPV lifetime improvement.
DOI: 10.5286/isis.e.rb1520221
title: Large Fractal Aggregates in Silica Rubber Nanocomposites

description: The self assembled structure of silica aggregates in polybutadiene rubber is vital to our understanding of dynamic energy dissipation effects in tyres. Previous experiments on LOQ and D11 have been valuable in showing the effect of an end functional dispersing polymer on the silica distribution, but have not been able to address the long-range organisation of the silica. Evidence from rheology suggests that networks do exist but can be suppressed by the end functional polymer. We therefore seek Xpress time on Larmor to explore the long-range organisation of silica in samples which have previously been studied by SANS and QENS.
DOI: 10.5286/isis.e.rb1520359
title: Onset of the dynamic disorder in benzoic (BA) and para-iodo-benzoic acid (IBA): a  Neutron Compton Scattering comparative study.

description: Halogen substituted benzoic acids were proposed for organic-organic heteroepitaxy in semiconductor industry for the many parameters, like hydrogen disorder or molecular polarizability,  that could be varied in order to affect the crystallinity and orientation of the growing semiconductor. Neutron diffraction (ND) has recently evidenced that positional disorder on the hydrogen atoms site appears in IBA only above 100K, i.e. there is a temperature offset of about 100K in the energy necessary for the proton hopping, as compared to the hydrogen disorder in BA. Moreover, Anisotropic Displacement Parameters in IBA are consistent with a low frequency out-of-plane libration of the COOH group, not present in BA. This proposal aims at mapping the ND evidenced differences in the onset of the dynamic disorder in BA and IBA by comparing the anisotropy of proton momentum distributions in BA and IBA.