2,378 Works

Determining Magnetic Order in the Intermediate Phase of LiYbO2

Recently, a new frustrated antiferromagnet, LiYbO2, was identified and has attracted attention as it undergoes a series of complex magnetic phase transitions within its diamond lattice of Yb3+ moments. Previous powder neutron diffraction experiments show that below 450 mK LiYbO2 locks into a fully ordered incommensurate helical ground state. Above this, a partially ordered phase exists that is not understood. Here, we seek to determine the nature of this partially ordered phase and clarify the...

Antiferromagnetic ordering in two-dimensional A2Ga2S5 (A = Fe, Mn) with puckered hexagonal nets

, &
This proposal is to explore the magnetic ordering present in a family of two-dimensional ternary metal chalcogenides Fe2Ga2S5 and Mn2Ga2S5 containing Fe2+ and Mn2+ ions arranged in unusual puckered hexagonal nets arising from a bilayer of triangular nets with coupling provided by sulfide ions. Neutron diffraction will be key to deducing experimentally the nature of the magnetic ordering.

Supramolecular deep eutectic solvents (SupraDES) and their interaction with water

, , , &
Deep eutectic solvents (DES) are a mixture of environmentally benign and inexpensive compounds, that - when combined - yield liquids at room temperature. Akin to ionic liquids, DES have been used as functional solvents in extractions, electrodepositions and synthetic chemistry. Cyclodextrins are large, cyclic molecules, which are hydrophilic on the outside and hydrophobic inside; their cavities are particularly suited to selectively capture molecules through noncovalent host−guest interactions (superamolecular chemistry). This study looks into the structure...

LaRhSn poly 500meV 600s 15K 49x49 49x449mm 49x49mm

BiCuxMn7-xO12: Towards the half-metallic limit

&
The BiCuxMn7-xO12 (BCMO) quadruple perovskite solid solutions exhibit an exceptionally rich phase diagram in temperature and Cu2+ concentration as the structure negotiates competing orbital and charge degrees of freedom, on top of a Bi3+ polar instability. For x = 2.5, BCMO is a half-metal ferrimagnet (Tc = 350 K), where double exchange produces spin-polarized itinerancy. We will study how the system evolves towards this limit from an insulating state distinguished by short range magnetic interactions...

Complex magnetic ordering in the topological kagome metals RMn6Sn6

, &
Following the recent discovery of a quantum-limit magnetic Chern phase in TbMn6Sn6, correlated topological metal RMn6Sn6 (R=Gd-Yb, and Y, Lu etc.), that possesses an ideal kagome lattice of Mn, has emerged as an exciting platform to explore the interplay between geometric frustration, non-trivial band topology and magnetism, as well as the resultant novel quantum phenomena. Inspired by the recent report of the anisotropically large THE and AHE in ErMn6Sn6, we propose to carry out the...

MDANSE (Molecular Dynamics Analysis of Neutron Scattering Experiments): users guide version 1.0

Rastislav Turanyi, MA Gonzalez, E Pellegrini & Sanghamitra Mukhopadhyay

Comparison of code coupling libraries for high performance multi-physics simulation

Philippa Rubin
The usability and performance of code coupling libraries are compared. In this work, MUI, MOOSE, preCICE, OpenPALM and PLE are considered. To compare performance, a 3D field exchange example was provided by the Scientific Computing Department at STFC. It is intended that this is a sufficiently general example to ensure this work applied to a wider range of the UK's Computational Collaborative Projects and High-End Computing Consortia.

Solvent contrast variation study of DNA nanocarriers based on Transportan peptides

, , , &
Cell-penetrating peptides (CPPs) are short amino acid sequences that can transport molecules or DNA into cells. Delivery of nucleic acids (DNA or RNA) into cells is attracting huge attention as a potential means to treat genetic diseases. We seek to determine the nanostructure of complexes formed between DNA and oppositely charged peptides, based on Transportans, which are a class of CPPs derived from natural sequences of wasp venom proteins and human neuropeptides. We will perform...

Low-energy excitations near a field induced magnetic quantum-critical line in Nb1-yFe2+y

, , , , &
Our previous neutron scattering on ferromagnetic (FM) Nb1-yFe2+y revealed that chemical-composition (y) tuning at zero field leads to a FM quantum-critical point (QCP) masked by a spin-density-wave (SDW). The excitation spectrum at zero field is characterised by enhanced soft modes with an exotic dispersion that reflects the presence of emerging SDW order. In contrast, transverse-field tuning of a FM Nb1-yFe2+y sample has revealed an unmasked FM QCP with a more conventional excitation spectrum expected by...

Low-energy excitations near a field induced magnetic quantum-critical line in Nb1-yFe2+y

, , , , &
Our previous neutron scattering on ferromagnetic (FM) Nb1-yFe2+y revealed that chemical-composition (y) tuning at zero field leads to a FM quantum-critical point (QCP) masked by a spin-density-wave (SDW). The excitation spectrum at zero field is characterised by enhanced soft modes with an exotic dispersion that reflects the presence of emerging SDW order. In contrast, transverse-field tuning of a FM Nb1-yFe2+y sample has revealed an unmasked FM QCP with a more conventional excitation spectrum expected by...

Solvent contrast variation study of DNA nanocarriers based on Transportan peptides

, , , &
Cell-penetrating peptides (CPPs) are short amino acid sequences that can transport molecules or DNA into cells. Delivery of nucleic acids (DNA or RNA) into cells is attracting huge attention as a potential means to treat genetic diseases. We seek to determine the nanostructure of complexes formed between DNA and oppositely charged peptides, based on Transportans, which are a class of CPPs derived from natural sequences of wasp venom proteins and human neuropeptides. We will perform...

Determining the equilibrium magnetic state of superconducting/ferromagnet heterostructures using polarised neutron reflectometry

, , , &
Spin triplet Cooper pairs are a key ingredient to realising superconducting spintronic devices as they provide both a source of supercurrent and carry a net spin. The observation of long-range triplet supercurrents in superconductor/ferromagnet bilayers, where the ferromagnet displays some non-collinear magnetism, has generated substantial interest in such heterostructures as a means to both generate and manipulate non-dissipative spin correlations and build spin-based devices.In order to understand how to control long-range triplets devices, we must...

F-model phase transition in spin ice thin films

, , &
Spin ice is an exotic magnet known for its magnetic monopole excitations and disordered magnetic ground state. This is an experiment on half micron thick epitaxial films of spin ice, that behave like bulk spin ice under in-plane compression. Specific heat measurements suggest that this leads to an unusual phase transition from the disordered spin ice state (the magnetic monopole vacuum) to an ordered state. Such a phase transition is known in the "F-model" of...

How do the binary AMP-antibiotic mixtures interact with inner and outer membranes of Gram-negative bacteria?

, , , , , &
Cationic antimicrobial peptides (AMPs) are comprised of hydrophobic and cationic amino acids. Lysine and arginine are the primary sources of cationicity. Aspartic acid (D), which is pH-responsive in the physiological pH range, can adjust cationicity and self-assembly in AMPs. AMPs with environment-responsive actions are potentially good carriers for loading traditional antibiotics, with the combined systems offering great promise for synergetic treatments against pathogenic bacteria based on different working mechanisms. However, the process of the combined...

Coupled Magnetoelectric materials via Cation exchange

, , &
Magnetoelectric materials – those that exhibit coupled ferromagnetic and ferroelectric behaviour – are predicted to have applications in a wide range of electronic devices.We have been using low-temperature cation-exchange reactions to substitute paramagnetic ions into hybrid-improper ferroelectric phases with the aim of inducing magnetoelectric coupling.Following this approach, we prepared MnSrNb2O7, FeSrNb2O7, CoSrNb2O7 and NiSrNb2O7.Magnetisation data indicate all 4 samples exhibit low-temperature phase transitions to ordered magnetic states which are accompanied by lattice parameter anomalies, suggestive...

Charbohydrate-mediated protein-protein interaction at membrane surface

, , , &
In Parkinson’s disease, the specific events causing neuronal disfunction and death are still elusive. We recently reported that the soluble GM1 oligosaccharide (OligoGM1) administered to neuroblastoma cells, has neurotrophic and neuroprotective properties. Molecular modelling suggests the formation of a stable trimeric complex between OligoGM1 and TrkA and NGF proteins, but the details of their specific interaction are not well understood. We are currently working at discriminating among possible scenarios and we here propose to detect...

Low-temperature magnetic excitations in a 3D S=1/2 bcc quantum spin-liquid candidate

, , , &
A quantum spin-liquid (QSL) state is a highly correlated and long-range entangled state of matter, which evades any thermodynamic phase-transition and remains dynamically disordered as a result of quantum fluctuations. QSL state in 1D is well established, but in a sense much restricted compared to all the varieties of QSL predicted for 2D and 3D. Rare-earth based pyrochlore and hyperkagome materials have been extensively studied since they can host very exotic ground-states stabilized by anisotropic...

Spin dynamics in a new hyperhoneycomb antiferromagnet

, &
This proposal is part of our research programme to explore novel ground states stabilized by frustrated interactions in quantum magnets. Here we plan to measure the spin dynamics in a novel Pr hyperhoneycomb lattice antiferromagnet, that we have recently succeeded in synthesizing for the first time. The hyperhoneycomb lattice has three-coordination as the planar honeycomb, but bond rotations make it a fully three-dimensional network. Strong spin-orbit coupling at the 4f Pr4+ ions with jeff=1/2 inside...

Registration Year

  • 2022
    2,378

Resource Types

  • Dataset
    2,366
  • Text
    8
  • Software
    3
  • Model
    1

Affiliations

  • University of Warwick
    1
  • University of Warwick - Warwick Business School
    1
  • Imperial College London
    1
  • Chatham House
    1