7,699 Works

Doped YAG nanoparticles: neutron diffraction to explain luminescent properties by the lattice features

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Doped YAG is an important material with interesting technological applications in inorganic electroluminescence displays, X-ray scintillators, etc. In order to control the morphology and particle size of products, we modified the preparation methods by adding some additives (polymers, metals and glasses), thus improving the luminescent properties. Particularly, one of the most interesting and puzzling result is that, when dealing with nano-powders with the same particle size, we observed the same emission spectra but values of...

Magnetic anisotropy and crystal structure distortions in ErB4

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We propose to investigate the unusual low-temperature behaviour of single crystal ErB4 in an applied magnetic field. At room temperature, the compound has a tetragonal structure in which the magnetic Er ions form a network of squares and triangles in that maps to the Shastry-Sutherland lattice, a rare example of highly frustrated system with an exact ground state solution. It has recently been found through the magnetisation and magnetostriction measurements that a significant anisotropy of...

Magnetic structure of a new quantum magnet

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CaCuTe2O6 belongs to the family of ACuTe2O6 that consists of a 3-dimensional arrangement of spin-1/2 Cu ions. Three main interactions are relevant in the system where the first neighbor interaction (J3) couples the Cu ions into isolated triangles, the second (J2) couples them into the highly frustrated hyperkagome lattice consisting of corner sharing triangles and the third neighbor interaction (J3) couples them into antiferromagnetic chains. J3 dominates the magnetism of CaCuTe2O6 where antiferromagnetic chains are...

Interplay between magnetism and superconductivity in the FeYSr2Cu2Oy iron substituted cuprate

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We want to address the problem of a possible coexistence of superconductivity and magnetism in the FeSr2YCu2Oy cuprate by means of a combined ZF/TF-muSR study. This compound presents a laminar ordering of copper and iron along the crystallographic c axis, allowing the study of the iron oxidation state effect in the superconducting and magnetic properties of this material. We have observed a progressive evolution from a magnetic parent compound at low doping levels to a...

UK Domestic Appliance Level Electricity (UK-DALE) - High speed (16 kHz) aggregated whole house current/voltage

Jack Kelly

Magnetism in the martensitic phase of Ni2Mn1.4In0.6 and Ni1.8Co0.2Mn1.4In0.6 magnetic shape memory alloys.

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We propose to solve the long standing controversy regarding the magnetic state of off-stoichiometric Heusler alloys Ni2Mn1.4In0.6 and Ni1.8Co0.2Mn1.4In0.6 at temperatures below the magneto-structural transition and establish whether the materials are compensated ferrimagnets with zero net moment or paramagnets.

Perylene Bisimide Photocatalysts

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Solar energy is the most abundant, sustainable, and environmentally friendly source of energy available on the earth. One promising approach to reducing the reliance on fossil fuels is to generate H2 and O2 by the photocatalytic splitting of water. Whilst there are significant data on inorganic materials that can be used for hydrogen evolution from water and overall water-splitting, there is relatively little information available for organic-based systems. Organic photocatalysts are interesting as they are...

Low temperature magnetic order and spin dynamics in Ho2Ir2O7

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Ho2Ir2O7 has a cubic pyrochlore structure. Trigonal crystal fields at both the Ho and Ir sites create Ising-like moments that can order in a non-collinear arrangement with moments along, or perpendicular to, the local [111] directions. Magnetization, heat capacity, and neutron scattering data indicate that Ho2Ir2O7 undergoes a sequence of magnetic transitions associated with the both the Ir and Ho moments. We propose to use muon spectroscopy to study the magnetic order in a polycrystalline...

Investigation of Li diffusion in Li-ion battery materials by muSR

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We would like to propose a continuation experiment on Li-ion battery cathode material, Li(Ni,Co)O2. In previous experiments in 2013 and 2014, we attempted muSR technique to practical cathode sheets of Li-ion battery to observe Li-ion diffusion in Li(Ni,Co)O2. We tried to extract a signal from Li(Ni,Co)O2, although the effect of Al foil in cathode sheets was not completely removed. As a result, we obtained dyanmic signals due to both Li-ion diffusion in Li(Ni,Co)O2 and muon...

SANS study of the effect of thermal annealing on the morphology of bulk heterojunction PffBT4T-2OD:fullerene thin films

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This projects aims to contribute to a better understanding of the relationship between processing conditions, active layer morphology and device performance in polymer solar cells (PSCs). To this end a series of SANS experiments are envisaged, to provide the most detailed understanding possible of the processing-morphology-performance relationships in polymer:fullerene solar cells based on a polymer with the best power conversion efficiencies (PCEs), namely PffBT4T-2OD (also known as PCE11). Optimized organic photovoltaic (OPV) processing, with its...

Aggregation of random co-polymers

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This proposal builds upon the successful study of a cationic copolymer capable of forming polymer micellar-like aggregates, simply by reducing pH (D33 at ILL 9-12-433 see report). Moreover, the size of aggregates could be tuned by adjusting pH during polymerisation. The copolymer system is comprised of a small mol. % (5-17) N, N-dimethylaminoethyl methacrylate (DMAEMA) copolymerised with methyl methacylate (MMA). This type of copolymer is significant for offering a simplified and direct route to cationic...

Magnetic order in polar oxides: Mn2FeWO6 and Mn2MnWO6

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Magnetoelectric materials, combining properties associated with magnetic and ferroelectric memory applications (e.g. in hard drives) are difficult to prepare but would represent a huge step forward in memory devices. Recently, theoretical work has highlighted several new classes of materials that might display such properties. One such family is derived from the corundum (Al2O3) structure but with various combinations of cations (including those with magnetic moments) instead of Al3+ cations. We propose to use neutron powder...

SANS characterization of hybrid vesicles lipid/polybutadiene-polyethyleneoxide (DPPC/OB) for the insertion of membrane proteins

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Amphiphilic polymers are biocompatible, tunable and versatile macromolecules used in biotechnology and drug delivery. Similarly to the phospholipids that constitute the membrane of cells, they form bilayers in the form of vesicles (polymersomes or PS). PS can be used, for instance, to deliver drugs and release them according to certain stimuli (temperature, pH...). The properties of PS can be tuned by modifying the chemical structure of the polymer itself or by mixing them with lipid...

Interaction of a pH-sensitive Polymer with a Model Lipid Membrane in the Form of Unilamellar Vesicles as Studied by SANS

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This SANS experiment was proposed by 4 PhD students from 3 different institutions in a Marie-Curie Training Network. They are all in the second year of their PhD and their individual research has come to the common point where they all wish to understand how a membrane lytic copolymer interacts with lipid membrane bilayer. As they all have acquired extensive skills in unilamellar vesicles they request 3 days of SANS2d beam time to examine how...

Adsorption of Fab and Fc from monoclonal antibody at the oil/water interface

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Following our previous study of adsorption of globular lysozyme and BSA, we continue to explore how different globular proteins adsorb at the oil/water interface by neutron reflection. Inter is preferred because we have built technical capability on this instrument. Fab and Fc are the constituents of a full mAb and we propose to study their adsorption before the whole mAb. Our specific aims are to (a) determine the actual thickness and volume fraction of Fab...

High Energy Spin Fluctuations in YFe2Ge2

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The recently discovered superconductor YFe2Ge2 (Tc about 1.8K) has the same crystal structure as 122 iron-based superconductors, with no static magnetic order be reported. However, our recent triple-axis experiment revealed strong spin fluctuations at Q=(1,0,1), corresponding to a stripe antiferromagnetic correlation consistent with in the 122 systems. Thus, there comes a contradiction between the similarity to 122 systems and the rather low Tc in YFe2Ge2. In order to have further understanding of the superconducting mechanism...

Neutron diffraction studies of the type of orbital ordering and spin structure associated with wide band SrMn1-xWxO3 (x= 0.1375 and 0.15)

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Our aim is to investigate the evolution of super-lattice structure (i.e. charge/orbital ordered phase) as well as the associated magnetic structure in SrMn1-xWxO3 (x=0.1375 & 0.15) as a function of temperature (T) (500-4K) by high-resolution neutron powder diffraction. Initial measurements of T dependent XRD (340K-80K) and electrical transport (390K-100K) have been done. Presence of strong CO/OO state at room temperature with compressed pseudo-tetragonal lattice has been observed for SrMn1-xWxO3. The type of lattice distortion associated...

Structural distortions at low temperature on the pyrochlore Yb2Ti2O7

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Magnetic frustration occurs when nearest-neighbor competing interactions cannot be simultaneously satisfied. Pyrochlores, whose crystalline lattices form corner-sharing tetrahedra, provide the perfect architecture for frustrated magnets. The research on pyrochlore compounds is intense and has already demonstrated remarkable features in magnetic materials. Meanwhile, a prominent example in this big family still stands alone. Studies on this Yb2Ti2O7, in many ways, generated more contradictory than clarifying results. After a set of experiments carried out on different samples,...

Negative thermal expansion in ReO3: anomalous variation with temperature

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ReO3 is a well-known oxide framework with unusual thermal expansion behaviour, exhibiting multiple regions of both positive and negative thermal expansion (NTE). We propose to investigate its local structure using total neutron scattering. We will analyse the resulting data using the reverse Monte Carlo method, with an emphasis on understanding the rigid unit mode fluctuations associated with NTE. The analysis will construct the distribution of atomic positions associated with these fluctuations, and from its temperature...

Investigation of the Evolution of Broken Time Reversal Symmetry in Pr1-xNdxOs4Sb12

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PrOs4Sb12 is a 1.85 K superconductor. Its superconductivity shows unconventional behavior, and the originating mechanism remains unknown. One characteristic is an internal magnetic field detected in the superconducting state of PrOs4Sb12, which breaks the time-reversal symmetry and does not appear in conventional type superconductivity. The isostructure compound NdOs4Sb12 becomes ferromagnetically ordered below 0.9 K. We have been investigating the effect of ferromagnetic moment of Nd on the unconventional superconductivity of PrOs4Sb12. This proposal plans to...

Solid Acetone as a Benchmark for Muon Quantum Effects

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Extreme muon quantum effects will be studied in the simple organic molecule acetone using ALC spectroscopy to determine the quantum averaged hyperfine parameters of the state formed by muon addition to a C=O bond. These measurements will span between the low temperature solid phase which is dominated by quantum motion of the muon and the high temperature liquid phase where thermally activated vibrations of the muon within the molecule produce a significant temperature dependent contribution...

Investigation of modulated crystal and magnetic structure of Ni-Pt-Mn-Ga ferromagnetic shape memory alloys

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Ferromagnetic shape memory alloys (FSMAs) are of recent interest because they exhibit a shapememory effect that can be driven by magnetic fields. Thus, FSMAs are important for practicalapplications since the actuation is faster than the conventional SMA driven by temperature orstress. Although Ni2MnGa shows largest magnetic field induced strain (~10%), but its brittlenessand low transition temperature have necessitated the search for new alloys with similar MFIS withhigher transition temperatures and ductility. Our initial work indicates...

Muon soft error effects at 16-nm FinFET technology nodes

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Semiconductor industry is currently offering 16 nm technology node with FinFET fabrication processes. Soft error causing mechanisms and error rates for FinFET technologies are expected to be vastly different from those for planar technologies. This proposal is for the investigation of muon-induced soft errors for 16 nm SRAM and flip-flop (FF) designs. We will be using standard SRAM designs and a custom test IC containing multiple hardened and non-hardened FF designs. Since soft errors caused...

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