New features of the long-wavelength polarisation analysis spectrometer—LONGPOL

Ersez, Tunay; Kennedy, S.J.; Hicks, T J; Fei, Y.; Krist, Thomas; Miles, Perry A.

doi:10.1016/s0921-4526(03)00233-3

Cited by 7 publications

(3 citation statements)

References 3 publications

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“…Whether constant wavelength or spallation, polarisation analysis can be used to separate magnetic from structural diffuse scattering [54][55][56][57].…”

Section: Neutronmentioning

confidence: 99%

Monte Carlo Modelling of Single-Crystal Diffuse Scattering from Intermetallics

Goossens

2016

Metals

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Single-crystal diffuse scattering (SCDS) reveals detailed structural insights into materials. In particular, it is sensitive to two-body correlations, whereas traditional Bragg peak-based methods are sensitive to single-body correlations. This means that diffuse scattering is sensitive to ordering that persists for just a few unit cells: nanoscale order, sometimes referred to as "local structure", which is often crucial for understanding a material and its function. Metals and alloys were early candidates for SCDS studies because of the availability of large single crystals. While great progress has been made in areas like ab initio modelling and molecular dynamics, a place remains for Monte Carlo modelling of model crystals because of its ability to model very large systems; important when correlations are relatively long (though still finite) in range. This paper briefly outlines, and gives examples of, some Monte Carlo methods appropriate for the modelling of SCDS from metallic compounds, and considers data collection as well as analysis. Even if the interest in the material is driven primarily by magnetism or transport behaviour, an understanding of the local structure can underpin such studies and give an indication of nanoscale inhomogeneity.

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“…Whether constant wavelength or spallation, polarisation analysis can be used to separate magnetic from structural diffuse scattering [54][55][56][57].…”

Section: Neutronmentioning

confidence: 99%

Monte Carlo Modelling of Single-Crystal Diffuse Scattering from Intermetallics

Goossens

2016

Metals

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“…Dedicated instruments for diffuse scattering are relatively rare, for example DNS at Jülich [20], D7 at the Institut Laue Langevin [19], Corelli at the Spallation Neutron Source [38], a custom-made laboratory X-ray machine [39,40], the E2 flat cone instrument at the Helmholtz-Zentrum Berlin für Materialien und Energie [41], and so on. However, many other instruments are capable of collecting high quality data, including the powder diffractometer at the Australian Synchrotron [42], SXD at the ISIS neutron source [27,[43][44][45], Wombat at the OPAL reactor [35,46], the SNBL beamline at ESRF [47], 11-ID-B at the Advanced Photon Source [48,49], and others [50][51][52].…”

Section: Isrn Materials Sciencementioning

confidence: 99%

Diffuse Scattering from Lead-Containing Ferroelectric Perovskite Oxides

Goossens

2013

ISRN Materials Science

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Ferroelectric materials rely on some type of non-centrosymmetric displacement correlations to give rise to a macroscopic polarisation. These displacements can show short-range order (SRO) that is reflective of the local chemistry, and so studying it reveals important information about how the structure gives rise to the technologically useful properties. A key means of exploring this SRO is diffuse scattering. Conventional structural studies use Bragg peak intensitiesto determine the average structure. In a single crystal diffuse scattering (SCDS) experiment, the coherent scattered intensity is measured at non-integer Miller indices, and can be used to examine the population of local configurations. This is because the diffuse scattering is sensitive to two-body averages, whereas the Bragg intensity gives single-body averages. This review outlines key results of SCDS studies on several materials and explores the similarities and differences in their diffuse scattering. Random strains are considered, as are models based on a phonon-like picture or a more local-chemistry oriented picture. Limitations of the technique are discussed.

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“…It had previously used iron filters with a flipping ratio of 3. In a cooperation between our institutes we provided coated wafers for one polarizing bender with a cross section of 25 mm × 50 mm and eight analyzers each with a cross section of 25 mm × 100 mm [6], which allowed the flipping ratio to be increased to 47.…”

Section: Solid State Bendermentioning

confidence: 99%

Trevor Hicks and solid state neutron optics

Krist¹

2009

J. Phys.: Condens. Matter

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Following an idea of Trevor Hicks we built neutron polarizing benders with silicon wafers forming the bender channels. In the last decade a variety of neutron optical devices based on this idea were realized such as collimators with absorbing as well as reflecting walls, radial benders and collimators and focusing devices which are all much shorter than their classical counterparts. Their development will be reviewed here.

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New features of the long-wavelength polarisation analysis spectrometer—LONGPOL

Cited by 7 publications

References 3 publications

Monte Carlo Modelling of Single-Crystal Diffuse Scattering from Intermetallics

Monte Carlo Modelling of Single-Crystal Diffuse Scattering from Intermetallics

Diffuse Scattering from Lead-Containing Ferroelectric Perovskite Oxides

Trevor Hicks and solid state neutron optics

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