41 Works

Quantitative optical spectroscopy of 87Rb vapour in the Voigt geometry in DC magnetic fields up to 0.4T [dataset]

Francisco S Ponciano-Ojeda, James Keaveney, Stefan M Rieche, Mark J Raine, Damian P Hampshire & Ifan G Hughes
We present a detailed spectroscopic investigation of a thermal 87Rb atomic vapour in magnetic fields up to 0.4T in the Voigt geometry. We fit experimental spectra with our theoretical model ElecSus and find excellent quantitative agreement, with RMS errors of ~0.3%. We extract the magnetic field strength and the angle between the polarisation of the light and the magnetic field from the atomic signal and find excellent agreement to within ~1% with a commercial Hall...

A parabolic level set reinitialisation method using a discontinuous Galerkin discretisation [figure data]

Thomas Adams, Nicholas McLeish, Stefano Giani & William M Coombs
Level set reinitialisation is a part of the level set methodology which allows one to generate, at any point during level set evolution, a level set function which is a signed distance function to its own zero isocontour. Whilst not in general a required condition, maintaining the level set function as a signed distance function is often desirable as it removes a known source of numerical instability. This paper presents a novel level set reinitialisation...

Splitting and recombination of bright-solitary-matter waves [dataset]

Oliver J. Wales, Ana Rakonjac, Thomas P. Billam, John L. Helm, Simon A. Gardiner & Simon L. Cornish
Solitons are long-lived wavepackets that propagate without dispersion and exist in a wide range of one-dimensional (1D) nonlinear systems. A Bose-Einstein condensate trapped in a quasi-1D waveguide can support bright-solitary-matter waves (3D analogues of solitons) when interatomic interactions are sufficiently attractive that they cancel dispersion. Solitary-matter waves are excellent candidates for a new generation of highly sensitive interferometers, as their non-dispersive nature allows them to acquire phase shifts for longer times than conventional matter-waves interferometers....

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...

Ultra-high speed Terahertz imaging using atomic vapour [dataset]

Lucy Alexandra Downes, Kevin John Weatherill, Andrew Rae MacKellar, Daniel James Whiting, Charles S. Adams & Cyril Bourgenot

Increased Lifetime of Metastable Skyrmions by Controlled Doping [dataset]

Thomas Birch
Previous observations of metastable magnetic skyrmions have shown that close to the equilibrium pocket the metastable state has a short lifetime, and therefore rapid cooling is required to generate a signi cant skyrmion population at low temperatures. Here, we report that the lifetime of metastable skyrmions in crystals of Cu2OSeO3 is extended by a factor of 50 with the introduction of only 2.5% zinc doping, allowing over 50% of the population to survive when eld-cooling...

Influence of soil grading on the hygro-mechanical properties of hyper-compacted earth for masonry construction [dataset]

Alessia Cuccurullo
This paper presents a study, at material scale, of the dependency between particle size distribution and the mechanical, hygroscopic and durability properties of compacted raw (unfired) earth for manufacturing bricks. Stiffness and strength are measured by unconfined compression tests while vapour adsorption/desorption is investigated by moisture buffering tests. In addition, the durability to water erosion is evaluated by immersion tests. All experiments were performed on cylindrical earth samples compacted at a very high pressure (100...

Biaxial Strain Dependence of Jc of a (RE)BCO Coated Conductor at 77 K in Low Fields [Dataset]

Jack R Greenwood
The attached dataset contains all of the data plotted in the figures in the article: Greenwood, Jack R, Surrey, Elizabeth & Hampshire, Damian (2019) 'The Biaxial Strain Dependence of Jc of a (RE)BCO Coated Conductor at 77 K in Low Fields,' IEEE Transactions on Applied Superconductivity (Volume: 29, Issue: 5, August 2019). Please see the README.txt file inside the .zip file for a more detailed description of the contents. Jack Greenwood March 2019 email: jack.r.greenwood@durham.ac.uk

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...

Optimisation of the coherence transfer delay in PSYCOSY experiments [dataset]

Alan Kenwright
We investigate by a combination of experimental measurements, Fokker-Planck theory simulations, and analytical predictions, the coherence evolution delay necessary in PSYCOSY experiments to ensure discrimination in favour of the larger correlations typically arising from short range (nJ, n<=3) 1H-1H couplings, and show that in general a coherence evolution delay of around 30 ms is optimum.

Finding spin-glass ground states using quantum walks [dataset]

Adam Callison
This file contains the numerical data supporting the numerical data supporting arXiv:1903.05003, the abstract used here is the abstract of that paper.

Substrate-Independent Epitaxial Growth of the Metal–Organic Framework MOF-508a. [dataset]

Matthew Wilson
Plasmachemical deposition is a substrate-independent method for the conformal surface functionalization of solid substrates. Structurally well-defined pulsed plasma deposited poly(1-allylimidazole) layers provide surface imidazole linker groups for the directed liquid-phase epitaxial (layer-by-layer) growth of metal–organic frameworks (MOFs) at room temperature. For the case of microporous [Zn (benzene-1,4-dicarboxylate)-(4,4′-bipyridine)0.5] (MOF-508), the MOF-508a polymorph containing two interpenetrating crystal lattice frameworks undergoes orientated Volmer–Weber growth and displays CO2 gas capture behavior at atmospheric concentrations in proportion to the number...

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...

The Development of Visually Guided Stepping [dataset]

Rachel Mowbray, Janna Gottwald, Manfei Zhao, Anthony Atkinson & Dorothy Cowie
Supporting data for "The Development of Visually Guided Stepping"

Wafer Defect Microscopy Enhancement using Perceptually Motivated Super-Resolution Convolutional Neural Networks [dataset]

Russell Maguire
The silicon super-resolution (SiSR) network is a new convolutional neural network for enhancing the inspection of defects in silicon devices. This paper demonstrates how the proposed SiSR network is able to upscale microscopy images of patterns and defects by x4 in each direction, aiding inspection in small--medium scale device fabrication. The alignment cameras of a laser-writer were repurposed to capture a large dataset of patterned wafer microscopy examples at two different magnification factors, but small...

Generalised classification of fluvial scenes with deep learning methods [dataset]

Patrice Carbonneau
This data is linked to code in the following GitHub repository: https://github.com/geojames/Self-Supervised-Classification

Yeavering, Northumberland, UK. Resource Assessment [dataset]

Tudor Skinner
This assessment report compiles existing information from a variety of sources pertinent to the multi-period archaeological site of Yeavering, Northumberland, UK. These sources of evidence are evaluated and synthesised and the report presents an overview of what we know and understand of the archaeology of Yeavering and its environs over time.

Late Prehistoric Stelae, Persistent Places and Connected Worlds: A Multi-Disciplinary Review of the Evidence at Almargen (Lands of Antequera, Spain) [dataset]

Marta Diaz-Guardamino
This paper examines how monuments with ‘local’ idiosyncrasies are key in processes of place-making and how, through persistence, such places can engage in supra-local and even ‘global’ dynamics. Departing from a detailed revision of its context, materiality, and iconography, we show how a remarkable Iberian ‘warrior stela’ brings together the geo-strategic potential of a unique site, located literally between the Mediterranean and the Atlantic worlds, the century-long dialogue between shared and local identities and the...

Rethinking Iberian ‘warrior’ stelae: a multidisciplinary investigation of Mirasiviene and its connection to Setefilla (Lora del Río, Seville, Spain) [dataset]

Marta Diaz-Guardamino
Iberian ‘warrior’ stelae have captured the imagination of researchers and the public for more than a century. Traditionally, stelae were considered ‘de-contextualised’ monuments, and research typically focused on the study of their iconography, paying little or no attention to their immediate contexts. As a result, despite the large number of these stelae known to date (c. 140) and the ample body of literature that has dealt with them, fundamental questions remain unanswered. This paper aims...

Advances in the use of biological stabilisers and hyper-compaction for sustainable earthen construction materials [dataset]

Alessia Cuccurullo
In the majority of cases, earthen construction materials for real buildings require amendment to deliver suitable material properties, which could be some additional strength or resilience to erosion. In modern earthen construction, in India, Australia and other parts of the world, cement and lime have been successfully used as stabilisers, providing both strength and durability benefits. However, the use of cement is detrimental to the green credentials of earthen construction materials, due to the large...

Coexistence of magnetic order and persistent spin dynamics in a quantum kagome antiferromagnet with no intersite mixing [dataset]

Andrej Zorko, Matej Pregelj, Martin Klanjšek, Matjaž Gomilšek, Zvonko Jagličić, James S. Lord, Joel A. T. Verezhak, Tian Shang, Wei Sun & Jin-Xiao Mi
One of the key questions concerning frustrated lattices that has lately emerged is the role of disorder in inducing spin-liquid-like properties. In this context, the quantum kagome antiferromagnet YCu3(OH)6Cl3, which has been recently reported as the first geometrically perfect realization of the kagome lattice with negligible magnetic/nonmagnetic intersite mixing and a possible quantum-spin-liquid ground state, is of particular interest. However, contrary to previous conjectures, here we show clear evidence of bulk magnetic ordering in this...

Kondo screening in a charge-insulating spinon metal [dataset]

Matjaž Gomilšek, Rok Žitko, Martin Klanjšek, Martin Pregelj, Christopher Baines, Yuesheng Li, Qingming Zhang & Andrej Zorko
The Kondo effect, an eminent manifestation of many-body physics in condensed matter, is traditionally explained as exchange scattering of conduction electrons on a spinful impurity in a metal. The resulting screening of the impurity's local moment by the electron Fermi sea is characterized by a Kondo temperature TK, below which the system enters a strongly-coupled regime. In recent years, this effect has found its realizations beyond the bulk-metal paradigm in many other conduction-electron systems, such...

The effect of ambient humidity on the stiffness and strength of a hyper-compacted silty clay for earth building [dataset]

Alessia Cuccurullo
The effect of pore suction and water content on the engineering properties of partially saturated soils has been extensively studied by geotechnical researchers. It is well known that unsaturated soils become stiffer, stronger and less permeable as suction increases and saturation decreases. The results from these studies are however not directly applicable to the analysis of earth buildings, which are made of coarser soils compacted to a much denser state. The present paper investigates the...

Magnetic order and enhanced exchange in the quasi-one-dimensional molecule-based antiferromagnet Cu(NO3)2(pyz)3 [dataset]

Tom Lancaster, Benjamin M Huddart, Jamie Brambleby, Paul A Goddard, Fan Xiao, Stephen J Blundell, Francis L Pratt, John Singleton, Piero Macchi, Rebecca Scatena, Alyssa M Barton & Jamie L Manson
The quasi-one-dimensional molecule-based Heisenberg antiferromagnet Cu(NO3)2(pyz)3 has an intrachain coupling J = 13.7(1) K and exhibits a state of long-range magnetic order below TN = 0.105(1) K. The ratio of interchain to intrachain coupling is estimated to be |J′/J| = 3.3 × 10−3, demonstrating a high degree of isolation for the Cu chains.

Registration Year

  • 2019

Resource Types

  • Dataset