A5049523307- Material Dynamics and Properties
- High-pressure geophysics and materials
- Advanced Condensed Matter Physics
- Solid-state spectroscopy and crystallography
- Spectroscopy and Quantum Chemical Studies
- Nuclear Physics and Applications
- Quantum, superfluid, helium dynamics
- Magnetic and transport properties of perovskites and related materials
- Physics of Superconductivity and Magnetism
- X-ray Diffraction in Crystallography
- Atomic and Subatomic Physics Research
- Multiferroics and related materials
- Rare-earth and actinide compounds
- Iron-based superconductors research
- Thermodynamic and Structural Properties of Metals and Alloys
- Theoretical and Computational Physics
- Advanced NMR Techniques and Applications
- Inorganic Fluorides and Related Compounds
- 3D Printing in Biomedical Research
- Radiation Detection and Scintillator Technologies
- Microfluidic and Capillary Electrophoresis Applications
- Advanced Chemical Physics Studies
- Magnetic Properties of Alloys
- Protein Structure and Dynamics
- Chemical Thermodynamics and Molecular Structure
Rutherford Appleton Laboratory
2015-2025
ISIS Neutron and Muon Source
2021-2025
China Spallation Neutron Source
2025
Didcot Community Hospital
2020
Science and Technology Facilities Council
2018-2020
Oxfam
2017
Research Complex at Harwell
2011-2016
Technical University of Munich
1997-2015
Institut Laue-Langevin
2002-2011
Heinz Nixdorf Stiftung
2009-2011
The search of novel quasi-1D materials is one the important aspects in field material science. Toroidal moment, order parameter ferrotoroidic order, can be generated by a head-to-tail configuration magnetic moment. It has been theoretically proposed that 1D dimerized and antiferromagnetic (AFM)-like spin chain hosts ferrotoroidicity toroidal moment composed only two antiparallel spins. Here, authors report candidate Ba6 Cr2 S10 with such theoretical model chain. structure consists unique...
We have studied the collective short wavelength dynamics in deuterated 1,2-dimyristoyl-sn-glycero-3-phoshatidylcholine (DMPC) bilayers by inelastic neutron scattering. The corresponding dispersion relation $\ensuremath{\hbar}\ensuremath{\omega}(Q)$ is presented for gel and fluid phase of this model system. temperature dependence excitations indicates a coexistence between two phases over broad range leads to different assignment from that reported preceding x-ray scattering study [Phys. Rev....
The diffusion coefficient of liquid aluminium has been obtained through coherent quasielastic neutron scattering. resulting values agree well with calculations derived from the viscosity applying Stokes-Einstein relation and ab initio calculations. temperature dependence constant displays an Arrhenius-type behavior a single activation energy 274 meV, consistent results by utilizing embedded atom method potentials.
The fundamental excitations in an antiferromagnetic chain of spins-1/2 are spinons, de-confined fractional quasiparticles that when combined pairs, form a triplet excitation continuum. In Ising-like spin the continuum is gapped and ground state N{\'e}el ordered. Here, we report high resolution neutron scattering experiments, which reveal how magnetic field closes this gap drives chains \YPP\ to critical, disordered Luttinger-liquid state. effective describe dynamics large, Yb moments,...
Neutron scattering in strong magnetic fields is used to show the spin resonance superconducting ${\mathrm{CeCoIn}}_{5}$ (${T}_{c}=2.3\text{ }\text{ }\mathrm{K}$) a doublet. The underdamped ($\ensuremath{\hbar}\ensuremath{\Gamma}=0.069\ifmmode\pm\else\textpm\fi{}0.019\text{ }\mathrm{meV}$) Zeeman splits into two modes at ${E}_{\ifmmode\pm\else\textpm\fi{}}=\ensuremath{\hbar}{\ensuremath{\Omega}}_{0}\ifmmode\pm\else\textpm\fi{}\ensuremath{\alpha}{\ensuremath{\mu}}_{B}{\ensuremath{\mu}}_{0}H$...
The self-diffusion process in a dense liquid is influenced by collective particle movements. Extensive molecular dynamics simulations for aluminium and rubidium evidence crossover the diffusion coefficient at about 1.4 times melting temperature <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:msub><a:mi>T</a:mi><a:mi>m</a:mi></a:msub></a:math>, indicating profound change mechanism. corresponding velocity autocorrelation functions demonstrate decrease of cage effect with gradual set...
The diffusion of sodium and carbonate ions in molten is investigated by quasi-elastic neutron scattering (QENS) at T = 1143 K. small wave vectors dominated diffusing ions, the derived self-diffusion coefficient DNa 4.5 × 10–5 cm2/s agrees well with previous tracer measurements. from anion coherent, coherent dominates QENS signal a modulus greater than 1 Å–1. line width function used to obtain this temperature DCO32– 2.4 cm2/s, again agreement values studies. results measurement are larger...
Comprehensive Summary Neutron diffraction studies of the low‐temperature relaxor ferroelectric phases [NH 4 ]M(HCO 2 ) 3 , where M = Mn 2+ and Zn show that a third NH + cations remain subtly structurally disordered to low temperature. All within channels are well separated from each other, with significant hydrogen bonds only anionic M(HCO framework. Complementary dynamics using H solid state NMR quasielastic neutron scattering indicate rotational motion in both paraelectric phases, which...
<a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mrow><a:msub><a:mrow><a:mi>Na</a:mi></a:mrow><a:mrow><a:mn>2</a:mn></a:mrow></a:msub></a:mrow><a:mi>BaCo</a:mi><a:mo stretchy="false">(</a:mo><a:mrow><a:msub><a:mrow><a:mi>PO</a:mi></a:mrow><a:mrow><a:mn>4</a:mn></a:mrow></a:msub></a:mrow><a:msub><a:mrow><a:mo stretchy="false">)</a:mo></a:mrow><a:mrow><a:mn>2</a:mn></a:mrow></a:msub></a:mrow></a:math> is a triangular antiferromagnet that displays highly...
We report a high energy-resolution neutron backscattering study to investigate slow motions on nanosecond time scales in highly oriented solid supported phospholipid bilayers of the model system DMPC -d54 (deuterated 1,2-dimyristoyl-sn-glycero-3-phoshatidylcholine), hydrated with heavy water. This technique allows discriminate onset mobility at different length for molecular components, as e.g.\@ lipid acyl-chains and hydration water between membrane stacks, respectively, provides benchmark...
Spin fluctuations are reported near the magnetic field driven quantum critical point in YbRh2Si2. On cooling, ferromagnetic evolve into incommensurate correlations located at q0=+/- (delta,delta) with delta=0.14 +/- 0.04 r.l.u. At low temperatures, an plane induces a sharp intra doublet resonant excitation energy E0=g muB mu0 H g=3.8 0.2. The intensity is localized zone center indicating precession of spin density extending xi=6 2 A beyond 4f site.
High performance batteries based on the movement of Li ions in x CoO2 have made possible a revolution mobile electronic technology, from laptops to phones. However, scarcity and demand for energy storage renewables has led intense interest Na-ion batteries, including structurally-related Na CoO2. Here we determined diffusion mechanism Na0.8CoO2 using diffuse x-ray scattering, quasi-elastic neutron scattering ab-initio molecular dynamics simulations, find that sodium ordering provides...
Myoglobin can be trapped in fully folded structures, partially molten globules, and unfolded states under stable equilibrium conditions. Here, we report an experimental study on the conformational dynamics of different apo- holomyoglobin solution. Global protein diffusion internal molecular motions were probed by neutron time-of-flight backscattering spectroscopy picosecond nanosecond time scales. was found to depend α-helical content suggesting that charges macromolecule increase short-time...
We have carried out muon spin relaxation (\ensuremath{\mu}SR), neutron diffraction, and inelastic scattering (INS) investigations on polycrystalline samples of Ce(Ru${}_{1\ensuremath{-}x}$Fe${}_{x}$)${}_{2}$Al${}_{10}$ ($x=0$, 0.3, 0.5, 0.8, 1) to investigate the nature ground state (magnetic ordered versus paramagnetic) origin spin-gap formation as evident from bulk measurements in end members. Our zero-field \ensuremath{\mu}SR spectra clearly reveal coherent two-frequency oscillations at...
Topological magnon insulators are a new class of magnetic materials that possess topologically nontrivial bands. As result, magnons in these display properties analogous to those electrons topological insulators. Here we present magnetization, specific heat, and neutron scattering measurements the ferromagnetic kagome magnet Cu(1,3-bdc). Our provide detailed description structure interactions this material confirm it is an ideal prototype for physics system with simple spin Hamiltonian.
A promising route to realize entangled magnetic states combines geometrical frustration with quantum-tunneling effects. Spin-ice materials are canonical examples of frustration, and Ising spins in a transverse field the simplest many-body model quantum tunneling. Here, we show that tripod kagome lattice material Ho${_3}$Mg${_2}$Sb${_3}$O${_{14}}$ unites an ice-like degeneracy terms generated by intrinsic splitting Ho$^{3+}$ ground-state doublet, which is further coupled nuclear spin bath....
High-entropy order-disorder phase transitions can be used for efficient and eco-friendly barocaloric solid-state cooling. Here the effect is reported in an archetypal plastic crystal, adamantane. Adamantane has a colossal isothermally reversible entropy change of 106 J K-1 kg-1. Extremely low hysteresis means that this accessed at pressure differences less than 200 bar. Configurational only account about 40% total change; remainder due to vibrational effects. Using neutron spectroscopy...
CaFe_{2}O_{4} is a S=5/2 anisotropic antiferromagnet based upon zig-zag chains having two competing magnetic structures, denoted as the A (↑↑↓↓) and B (↑↓↑↓) phases, which differ by c-axis stacking of ferromagnetic stripes. We apply neutron scattering to demonstrate that phase order parameters result in antiphase boundaries along c freeze on time scale ∼1 ns at onset 200 K. Using high resolution spectroscopy, we find quantized spin wave levels measure 9 such excitations localized regions...
Designing next-generation fuel cell and filtration devices requires the development of nanoporous materials that allow rapid reversible uptake directed transport water molecules. Here, we combine neutron spectroscopy first-principles calculations to demonstrate molecular H
Detailed spin-wave spectra of magnetoelectric ${\text{LiNiPO}}_{4}$ have been measured by neutron scattering at low temperatures in the commensurate (C) antiferromagnetic (AF) phase below ${T}_{N}=20.8\text{ }\text{K}$. An anomalous shallow minimum is observed modulation vector incommensurate (IC) AF appearing above ${T}_{N}$. A linear model based on Heisenberg exchange couplings and single-ion anisotropies accounts for all dispersions intensities. Along $b$ axis an unusually strong...
We present neutron scattering measurements on the dynamics of haemoglobin (Hb) in human red blood cells (RBCs) vivo . Global and internal Hb were measured ps to ns time Å length scales using quasi-elastic backscattering spectroscopy. observed cross over from global short-time long-time self-diffusion. Both short- diffusion coefficients agree quantitatively with predicted values hydrodynamic theory non-charged hard-sphere suspensions when a bound water fraction around 0.23 gram H 2 O per is...
Living cultured cells react to external influences, such as pharmaceutical agents, in an intricate manner due their complex internal signal processing. Impedance sensing of on microelectrodes is a favored label-free technology indicate cellular events, usually ascribed morphologic alteration or changes adhesion, which found stand-alone systems that do not incorporate life support additional sensor systems. However, only symbiosis with metabolic activity and picture documentation may complete...