194 Works

Data for "Driven-dissipative many-body systems with mixed power-law interactions: Bistabilities and temperature-driven nonequilibrium phase transitions"

Nikola Šibalić
We investigate the nonequilibrium dynamics of a driven-dissipative spin ensemble with competing power-law interactions. We demonstrate that dynamical phase transitions as well as bistabilities can emerge for asymptotic van der Waals interactions, but critically rely on the presence of a slower decaying potential core. Upon introducing random particle motion, we show that a finite gas temperature can drive a phase transition with regards to the spin degree of freedom and eventually leads to mean-field behavior...

Correlated magnetic oxides studied using muon-spin spectroscopy: Supporting data

Robert Williams & Tom Lancaster
Supporting data for the PhD thesis of R C Williams: "Correlated magnetic oxides studied using muon-spin spectroscopy"

Data for "Superconducting Properties of Titanium Alloys (Ti-64 and Ti-6242) for Critical Current Barrels"

F. J. Ridgeon, M. J. Raine, D. P. Halliday, M. Lakrimi, A. Thomas & Damian Hampshire
Abstract fro paper — We have measured the superconducting properties of the titanium alloy Ti-6Al-4V (Ti-64) as-supplied and following two of the heat treatment schedules used for the Nb3Sn strands in the ITER tokamak. The Ti-64 alloy is the standard choice in the superconducting community for the barrels used to make critical current (IC) measurements in high magnetic fields at cryogenic temperatures. Ti-64, which has a two-phase alpha + beta microstructure and contains vanadium (nb...

Supporting data: "Magnetic phase diagram of La_{2-x}Sr_{x}CoO_{4} revised using muon-spin relaxation"

Tom Lancaster
Abstract form the article: We report the results of a muon-spin relaxation (μSR) investigation of La_{2-x}Sr_{x}CoO_{4}, an antiferromagnetic insulating series which has been shown to support charge ordered and magnetic stripe phases and an hourglass magnetic excitation spectrum. We present a revised magnetic phase diagram, which shows that the suppression of the magnetic ordering temperature is highly sensitive to small concentrations of holes. Distinct behavior within an intermediate x range (0.2≤x≲0.6) suggests that the putative...

Data from "Spectroscopic detection of atom-surface interactions in an atomic vapour layer with nanoscale thickness"

K.A. Whittaker, J. Keaveney, A. Sargsyan, D. Sarkisyan, I.G. Hughes & C.S. Adams
Abstract from article: We measure the resonance line shape of atomic vapor layers with nanoscale thickness confined between two sapphire windows. The measurement is performed by scanning a probe laser through resonance and collecting the scattered light. The line shape is dominated by the effects of Dicke narrowing, self-broadening, and atom-surface interactions. By fitting the measured line shape to a simple model we discuss the possibility to extract information about the atom-surface interaction.

Data for: "Real-Time Near-Field Terahertz Imaging with Atomic Optical Fluorescence"

Christopher G. Wade, Nikola Šibalić, Natalia R. De Melo, Jorge M. Kondo, Charles S. Adams & Kevin J. Weatherill
Terahertz (THz) near-field imaging is a flourishing discipline, with applications from fundamental studies of beam propagation to the characterisation of metameterials and waveguides. Beating the diffraction limit typically involves rastering structures or detectors with length scale shorter than the radiation wavelength; in the THz domain this has been achieved using a number of techniques including scattering tips and apertures. Alternatively, mapping THz fields onto an optical wavelength and imaging the visible light removes the requirement...

Could High H98-Factor Commercial Tokamak Power Plants Use Nb–Ti Toroidal Field Coils? [dataset]

S. B. L. Chislett-McDonald
In large engineering applications, materials that can fail by brittle fracture are avoided if there are practical, ductile alterna-tives. In recent years, advances in the experimental control and shaping of fusion energy plasmas have produced confinement times that are longer than the accepted IPB98(y,2) values (i.e. higher H98-factors). Detailed understanding of these enhancements in H98-factor is not available, but values as large as 1.5 - 1.8 may be possible [1, 2]. If such high values...

Local magnetism, magnetic order and spin freezing in the 'nonmetallic metal' FeCrAs [dataset]

T Lancaster, B M Huddart, M T Birch, F L Pratt, D G Porter, S J Clark, S R Julian, P D Hatton, S J Blundell & W Wu
We present the results of x-ray scattering and muon-spin relaxation (μ+SR) measurements on the iron-pnictide compound FeCrAs. Polarized non-resonant magnetic x-ray scattering results reveal the 120° periodicity expected from the suggested three-fold symmetric, noncollinear antiferromagnetic structure. μ+SR measurements indicate a magnetically ordered phase throughout the bulk of the material below TN = 105(5) K. There are signs of fluctuating magnetism in a narrow range of temperatures above TN involving low-energy excitations, while at temperatures well...

3D Properties in (RE)BCO Tapes measured in Fields up to 35 T [dataset]

Satoshi Awaji, Elizabeth Surrey, Tatsunori Okada & Mark J. Raine
We have measured the temperature and angular dependence of the upper critical field (B¬_C2) for three state of the art (RE)BCO HTS tapes using variable-temperature ac susceptibility measurements in applied fields up to 35 T. The three tapes measured were a Fujikura tape without artificial pinning centers and Superpower tapes with and without artificial pinning centers. We have obtained fits to our B_C2 (T,θ) data using both the anisotropic Ginzburg-Landau (G-L) model and Klemm’s model...

SIPG fracture data supporting: A quasi-static discontinuous Galerkin configurational force fracture propagation method for brittle materials [IJNME (2017)]

R.E. Bird, W.M. Coombs & S. Giani
Abstract from paper: This paper presents a framework for r-adaptive quasi-static configurational force (CF) brittle crack propagation, cast within a discontinuous Galerkin (DG) symmetric interior penalty (SIPG) finite element scheme. Cracks are propagated in discrete steps, with a staggered algorithm, along element interfaces which align themselves with the predicted crack propagation direction. The key novelty of the work is the exploitation of the DG face stiffness terms existing along element interfaces to propagate a crack...

Electrical and mechanical diagnostic indicators of wind turbine induction generator rotor faults [dataset]

Donatella Zappalá
In MW-sized wind turbines, the most widely-used generator is the wound rotor induction machine, with a partially-rated voltage source converter connected to the rotor. This generator is a significant cause of wind turbine fault modes. In this paper, a harmonic time-stepped generator model is applied to derive wound rotor induction generator electrical & mechanical signals for fault measurement, and propose simple closed-form analytical expressions to describe them. Predictions are then validated with tests on a...

Quantum magnetism in molecular spin ladders probed with muon-spin spectroscopy [dataset]

Tom Lancaster, Fan Xiao, Ben Huddart, Robert Williams, Francis Pratt, Blundell, Stephen, , Stewart Clark, Robert Scheuermann, Tatsuo Goko, Simon Ward, Jamie Manson, Christian Ruegg & Karl Kramer
We present the results of muon-spin spectroscopy (μ+SR) measurements on the molecular spin ladder system (Hpip)2CuBr4(1−x)Cl4x, [Hpip=(C5H12N)]. Using transverse field μ+SR we are able to identify characteristic behaviour in each of the regions of the phase diagram of the x=0 strong-rung spin ladder system (Hpip)2CuBr4. Comparison of our results to those of the dimer-based molecular magnet Cu(pyz)(gly)(ClO4) shows several common features. We locate the crossovers in partially disordered (Hpip)2CuBr4(1−x)Cl4x (x=0.05), where a region of behaviour...

Data for "Optimised conditions for the synthesis of 17O and 18O labelled cholesterol"

Robert V Law, Celia De La Calle Arregui, Jonathan A Purdie, Catherine A Haslam & John M Sanderson
A file index info.txt is present in the zip archive

Data from "EIA in a non-degenerate three-level ladder system"

D. J. Whiting, E. Bimbard, J. Keaveney, M. A. Zentile, C. S. Adams & I. G. Hughes
Abstract from article: We investigate, theoretically and experimentally, the transmission of light through a thermal vapour of three-level ladder-type atoms, in the presence of 2 counter-propagating control fields. A simple theoretical model predicts the presence of electromagnetically induced absorption (EIA) in this pure three-level system when the control field is resonant. Experimentally, we use Rb-87 in a large magnetic field of 0.62 T to reach the hyperfine Paschen-Back regime and realise a non-degenerate three-level system....

Exchange constants in molecule-based magnets derived from density functional methods

Tom Lancaster, Stewart Clark & Iori Thomas
Cu(pyz)(NO3)2 is a quasi-one-dimensional molecular antiferromagnet that exhibits three-dimensional long-range magnetic order below T N = 110 mK due to the presence of weak interchain exchange couplings. Here, we compare calculations of the three largest exchange coupling constants in this system using two techniques based on plane-wave basis-set density functional theory: (i) a dimer fragment approach and (ii) an approach using periodic boundary conditions. The calculated values of the large intrachain coupling constant are found...

Data Supporting "Interfacial contribution to thickness dependent in-plane anisotropic magnetoresistance", AIP Advances 5, 127108 (2015)

Mustafa Tokac, Mu Wang, Samridh Jaiswal, Andrew Rushforth, Bryan Gallagher, Del Atkinson & Aidan Hindmarch
(Abstract from article) We have studied in-plane anisotropic magnetoresistance(AMR) in cobaltfilms with overlayers having designed electrically interface transparency. With an electrically opaque cobalt/overlayer interface, the AMR ratio is shown to vary in inverse proportion to the cobaltfilm thickness; an indication that in-plane AMR is a consequence of anisotropic scattering with both volume and interfacial contributions. The interface scattering anisotropy opposes the volume scattering contribution, causing the AMR ratio to diminish as the cobaltfilm thickness is...

Sildenafil citrate data bundle

Paul Hodgkinson
A combination of solid-state NMR techniques, including 13C/1H correlation, 2H magic-angle spinning NMR and first principles calculation are employed to characterise the role of water in different hydration states of sildenafil citrate. The 13C spectrum is fully assigned for the first time and direct correlations made with respect to the crystal structure. 2H magic-angle spinning NMR is demonstrated to be a powerful tool for the study of dynamic and exchange processes in complex hydrate systems,...

Data from: "From short-time diffusive to long-time ballistic dynamics: the unusual center-of-mass motion of quantum bright solitons"

Christoph Weiss, Simon A. Gardiner & Heinz-Peter Breuer
Brownian motion is ballistic on short time scales and diffusive on long time scales. Our theoretical investigations indicate that one can observe the exact opposite - an anomalous diffusion process where initially diffusive motion becomes ballistic on longer time scales - in an ultracold atom system with a size comparable to macromolecules. This system is the center-of-mass motion of a quantum matter-wave bright soliton for which the dominant source of decoherence are three-particle losses. Our...

Fast native-MATLAB stiffness assembly for SIPG linear elasticity

R. Bird, W.M. Coombs & S. Giani
When written in MATLAB the finite element method (FEM) can be implemented quickly and with significantly fewer lines, when compared to compiled code. MATLAB is also an attractive environment for generating bespoke routines for scientific computation as it contains a library of easily accessible inbuilt functions, effective debugging tools and a simple syntax for generating scripts. However, there is a general view that MATLAB is too inefficient for the analysis of large problems. Here this...

Spin transport across the interface in ferromagnetic/nonmagnetic systems [dataset]

C Swindells
Understanding interfacial spin transport is key to developing magnetoelectonic devices, however the exact nature of parameters involved is unclear. Here, we report a detailed ferromagnetic reso- nance based spin-transport analysis on a variety of structures of both ferromagnetic (Co, CoFeB) and heavy metal layers (Pt, Ru) in order to fully quantify interfacial spin transport parameters. Enhanced spin-mixing conductance is observed for more closely matched ferromagnet and heavy metal crystal structures, and, significantly, inclusion of a...

Supporting data: Measurement of the binding energy of ultracold 87Rb133Cs molecules using an offset-free optical frequency comb

Peter K. Molony
Data for the above publication, and Excel spreadsheets of the main analysis and error calculations.

Registration Year

  • 2015
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  • 2016
    53
  • 2017
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  • 2018
    35
  • 2019
    42

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