10,519 Works

Investigating the interplay of spin orbit coupling and electron correlation in new family of noncentrosymmetric superconductors

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The possibility of singlet-triplet pairing in noncentrosymmetric (NCS) superconductors makes them prime candidates to exhibit time-reversal symmetry breaking (TRSB). However, there are only a handful of superconductors that exhibit TRSB. More importantly, the role played by the relative strength of spin-orbit coupling and electron correlation in parity mixing and TRSB is still unresolved. To this end, we propose to measure a new family of NCS superconductors ZrMo2Ru3 and HfW2Os3. Interestingly, ZrMo2Ru3 contain only 4d elements...

Investigating the interplay of spin orbit coupling and electron correlation in new family of noncentrosymmetric superconductors

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The possibility of singlet-triplet pairing in noncentrosymmetric (NCS) superconductors makes them prime candidates to exhibit time-reversal symmetry breaking (TRSB). However, there are only a handful of superconductors that exhibit TRSB. More importantly, the role played by the relative strength of spin-orbit coupling and electron correlation in parity mixing and TRSB is still unresolved. To this end, we propose to measure a new family of NCS superconductors ZrMo2Ru3 and HfW2Os3. Interestingly, ZrMo2Ru3 contain only 4d elements...

Nano-Sized Effect on Magnetic Properties of La2CuO4

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Nano-sized effect of ferromagnetic and antiferromagnetic materials has much attention in the recent years due to their unique properties. In the last beam time, we got 3 days to starting this research and we successfully measured our two samples. The suppression of TN was observed by reducing particle size but the saturated internal field is same with that of bulk-LCO, indicating magnetic structure of Cu spins which appear in nano-LCO is same with that observed...

Liquid structure of sulfuric acid and derived protic ionic liquids

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Ionic liquids (ILs) are liquids consising entirely of ions, known for unique physico-chemical properties, which can be tuned in a wide range of parameters. They have the potential for wide-spread uses: as solvents for biomass, electrolytes for batteries and media for gas separation and storage, to name a few - but many tend to be very expensive. In this work we study ionic liquids based on sulfuric acid and a simple amine, which have two...

Magnetic and structural dynamics in the multiple Coulomb phase CsNiCrF6

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In materials with correlated disorder (i.e. not completely random nor completely ordered), new physics and functionalities can occur. Correlated disorder can be treated conveniently by field theories, so that the basic (crystal or magnetic) structure of the material becomes the empty vacuum of the theory, and fluctuations or excitations of the structure are the particles. In CsNiCrF6, both structural and magnetic correlated disorder can be identified. Here we propose to use inelastic polarised neutron scattering...

Earth Abundant NASICON Materials for Lithium Battery Applications, Li3Fe(MoO4)3 and Li1.6Mn2.2(MoO4)3

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The framework materials Li3Fe(MoO4)3 and Li1.6Mn2.2(MoO4)3 contain networks of Fe/MnO6 and MoO4 units. These compounds are similar structures to the recently reported cathode material Li3Cr(MoO4)3 showing exceptional lithium storage based on redox activity of Mo in addition to the transition metal. We have found exceptionally high Li+ conductivity in the title phases. The structures of these materials have been determined previously using X-ray scattering, which is notoriously unreliable in detecting the subtle interstitial sites and...

Structural study of the effect of barium doping in Sr3Ru2O7

The capability of systematically tuning electronic properties of strongly correlated electron systems is key to unraveling the mechanisms underlying the observed physics. Sr3Ru2O7 has been widely studied due to a highly correlated zero field ground state dominated by magnetic interactions giving rise to a quantum phase transition and formation of an unconventional high-field phase. Its structure consists of bilayers of RuO6 octahedra separated by SrO layers offering an ideal test case for the control of...

Soft-templating of hard carbons to produce ordered and disordered Hard carbons.

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Carbonized biowaste presents a promising route to producing energy materials in a carbonnegative way, given that the precursor material (i.e. plant material) relies on the conversion ofatmospheric CO2 to sugar molecules. By treating cellulose, starch or other sugar molecules athigh temperature (230 oC) and pressure in aqueous solution, an amorphous high carbon materialis formed. This hydrothermal carbon (HTC) can be further modified to produce battery anodes,water purification filters, supercapacitors, fuel cells and catalyst supports. This...

Soft-templating of hard carbons to produce ordered and disordered Hard carbons.

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Carbonized biowaste presents a promising route to producing energy materials in a carbonnegative way, given that the precursor material (i.e. plant material) relies on the conversion ofatmospheric CO2 to sugar molecules. By treating cellulose, starch or other sugar molecules athigh temperature (230 oC) and pressure in aqueous solution, an amorphous high carbon materialis formed. This hydrothermal carbon (HTC) can be further modified to produce battery anodes,water purification filters, supercapacitors, fuel cells and catalyst supports. This...

Low-energy spin excitations in Ni over-doped NaFe0.7Ni0.3As

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The discovery of iron-based superconductors gives a new horizon to study unconventional superconductivity. Typically iron-based superconductors can be created by doping (i.e. replace Fe ions with) Co or Ni in some parent compounds such as NaFeAs. It is believed the magnetism in these materials is strongly coupled to superconductivity. One way to probe the magnetism in these materials is to observe the spin gap by inelastic neutron scattering. Our previous experiment shows no gap for...

Determining the Crystal and Magnetic Structures of [Li(oxalate)]2[Co5(OH)8]

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Dense corrdination frameworks that contain inorganic centres connected into extended lattices by polyatomic anions often adopt highly anisotropic structures. Thus they often have strong magnetic interactions in only one or two dimensions and, in the latter case, can also be designed so they have strongly competing interaction that give rise to magnetic frustration. Recently discovered [Li(oxalate)]2[Co5(OH)8] appears likely to be one such two dimensional magnet. We will determine the structure of its antiferromagnetic state, which...

Hydration behaviour of uranyl chloride: from fundamental chemistry to environmental applications

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In water uranium exists almost exclusively as the uranyl ion [UO2]2+. In the presence of halides these can form complexes of the type [UO2(H2O)nClx]2-x, whose thermodynamics and structures in solution are not fully understood. This is important as high halide concentrations are expected to be found in spent nuclear fuels or under certain environmental conditions. In this work we propose to study the reaction of uranyl chloride [UO2(H2O)5][Cl]2 with LiCl under increasing halide concentrations to...

How do Surfactants Interact with Complex Monoclonal Antibodies at Oil/Water Interfaces?

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Heavily bio-engineered monoclonal antibodies (mAbs) are an increasingly important trend in the biopharmaceutical industry. However, these mAbs are often destabilised by the silicone oil found in pre-filled syringes, which are the preferred storage and application method for these drugs. This effect can be reduced by adding biologically safe surfactants to the formulation, but the mechanism by which this protects the mAb is currently not proven. This study will investigate the mAb-surfactant-silicone oil interaction, using several...

uSR study of low temperature magnetism in Li NMC 811

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LiNi0.8Mn0.1Co0.1O2 (Li NMC 811) is a next generation Li ion battery cathode material. We are investigating the magnetic properties of Li NMC 811 to track the changes in local ordering of the magnetic ions and changes in oxidation state as a function of electrochemical cycling. Here we focus on pristine Li NMC 811 which contains S=1/2 Ni3+, S=1 Ni2+, S=3/2 Mn4+ and S=0 Co3+. In addition it is prone to off-stoichiometry and Li/Ni site disorder...

ISIS Commercial access : TRAD

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ISIS commercial access.

Can identical crystals melt into two distinct liquids?

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Seemingly identical molecular crystals of acetaldehyde phenylhydrazone (APH), C8H10N2, are reported to melt to liquids with distinctly different structures, and with different melting points of between 60 and 100 C. The low- or high-melting forms can be reliably prepared by exposure of crystals to trace acid or base (as little as 1/1000th molar equivalent) respectively, with no detectable change to the crystal structure. Although rare, this remarkable and strange behavior demands further investigation. It has...

Measurement of Reference Cross Sections of Li-ion Battery Materials via Energy Selective Neutron Imaging

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We would like to measure the reference cross sections of lithium-ion battery (LIB) materials. This is the first step of a project that will serve as a baseline to understand the transport limiting mechanisms that are on of the main reasons for capacity losses in LIBs. This technique has been used with 6-Li and 2-H isotopes, since they have a greater attenuation than their natural homologous. Here we would like to prove that energy selective...

SANS study of the nanostructure of water-in-salt electrolytes confined in mesoporous carbons

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Water in Salt electrolytes are new promising materials for application in lithium batteries, which comprise aqueous solutions of super-concentrated lithium salts (concentration >3M) with some interesting properties such as high electrochemical stability window, high lithium transference number, good ionic conductivity and decoupling of ionic mobility from viscosity. Experiments performed in the Helmholtz Zentrum-Berlin show that these solutions present nano-heterogeneities of around 1.25nm evidenced by a broad peak in SANS curves. In a battery, the electrolyte...

Conformational entropy and internal dynamics upon protein ligand binding.

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Conformational changes and protein dynamics are closely linked to protein ligand interactions. Both the conformational entropy and internal dynamics can change upon ligand binding. The proposed system of biotin and streptavidin has a stoichiometry of 4 biotin per streptavidin. Previous experiments have shown that while the internal dynamics differ for different timescales the change in conformational entropy is the same. The thermal stability of streptavidin has been shown to be affected by the ratio of...

Using Neutron Tomography to study aqueous alteration processes on Mars

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Understanding the fluid pathways and timing(s) of fluid flow within Martian meteorites is critical to our understanding of the nature and origin of water at or near the red planet’s surface. Elucidating Mars’ aqueous past is critical to major questions on past or current habitable environments on Mars and the investigation of rocks and minerals formed through aqueous processes is a key driver for ESA and NASA robotic exploration missions. Neutron tomography’s sensitivity to hydrous...

Investigation of magnetic structure of new multiferroic compound LiFeV2O7

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Ferroelectric polarization in type-II multiferroics is induced below long-range magnetic ordering with certain magnetic structure that breaks the inversion symmetry. Here we have investigated polar magnetic oxide LiFeV2O7 which shows a change in polarization at the magnetic ordering. This indicates that the magnetic structure couples to lattice and induces a change in electric polarization. Therefore, it is important to understand the nature of the magnetic structure which is responsible for inducing polarization. It is for...

Magnetic field effect on low-energy spin excitations in a novel quantum spin liquid candidate

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We plan to study the effect of magnetic field on the spin excitations in the newly discovered quantum spin liquid Na2BaCo(PO4)2. Our preliminary inelastic neutron scattering measurements on the powder sample reveals that the spin-excitation is continuum-type at base T (1K) without external field, with band-width in the order of 0.1 to 0.2 meV. With a large enough field above the critical value (Hc ~ 2T), the energy of the spin excitations is lifted. Most...

Study of spin-phonon coupling to understand the multiferroic properties of polar magnetic oxides DyMWO6 (M = Cr, Fe) using Inelastic Neutron

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Polar magnets, an interesting family of compounds both fundamentally and technologically as they exhibit rich variety properties such as magnetism, ferroelectricity, pyroelectricity, magnetodielectric/electric effect, and multiferroicity. Recently, we reported new polar magnets DyMWO6 (M = Cr, Fe) crystallize in orthorhombic structure with space group Pna21 exhibit interesting magnetic and magnetoelectric properties. DyFeWO6 compound shows spin induced multiferroicity whereas DyCrWO6, not a multiferroic. However, the origin of the interplay between magnetism and ferroelectricity remains unsolved in...

Magnetic excitations in AgCrSe2

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AgCrSe2 has emerged as a material of great interest due it its good thermoelectric performance. It also has an interesting cycloidal magnetic structure. While studying the thermoelectric parameters we have discovered that the previously published magnetic interactions are inconsistent with the magnetic structure. We now propose to study the magnetic excitations to higher energy than have previously been possible using MAPS which will allow us to resolve this.

Unravelling the interfacial structure of crude oil/saltwater/surfactant system with temperature and under shear

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Surface engineered sponges (SEnS) are emerging absorbents for the recovery of crude oil microdroplets from wastewater. For practical viability, the physicochemical surface structures of the SEnS need to engineered to compliment the physicochemical structure and properties of surfactant-stabilized oil microdroplets in saltwater. This work aims to determine the interfacial structure of the crude oil/seawater/surfactant system using Rheo-SANS. Specifically, the influence of surfactant concentration, temperature, and shear rate on the structure and rheological properties of emulsions...

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