Flux-lines lattice order and critical current studied by time-of-flight small-angle neutron scattering

Pautrat, Alain; Brûlet, Annie; Simon, Charles; Mathieu, P.

doi:10.1103/physrevb.85.184504

Cited by 10 publications

(15 citation statements)

References 40 publications

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“…42(b) which leads to RC broadening. Subsequent studies using a time-of-flight approach to SANS yielded consistent results (Pautrat et al, 2012).…”

Section: )mentioning

confidence: 71%

“…associating the PE with a bulk order-disorder transition is widely accepted, this is not universal. This is due to some observations of an ordered VL above the PE (Pautrat et al, 2009(Pautrat et al, , 2007 and studies which indicate that this is caused by surface rather than bulk pinning (Pautrat et al, 2012). Here, one should note that few SANS measurements are performed under the same exact conditions (transport currents, AC fields) as those used to determine the PE.…”

Section: Relating Structural and Dynamic Propertiesmentioning

confidence: 99%

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Magnetic small-angle neutron scattering

et al. 2019

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Small-angle neutron scattering (SANS) is one of the most important techniques for microstructure determination, being utilized in a wide range of scientific disciplines, such as materials science, physics, chemistry, and biology. The reason for its great significance is that conventional SANS is probably the only method capable of probing structural inhomogeneities in the bulk of materials on a mesoscopic real-space length scale, from roughly 1 − 300 nm. Moreover, the exploitation of the spin degree of freedom of the neutron provides SANS with a unique sensitivity to study magnetism and magnetic materials at the nanoscale. As such, magnetic SANS ideally complements more real-space and surface-sensitive magnetic imaging techniques, e.g., Lorentz transmission electron microscopy, electron holography, magnetic force microscopy, Kerr microscopy, or spinpolarized scanning tunneling microscopy. In this review article we summarize the recent applications of the SANS method to study magnetism and magnetic materials. This includes a wide range of materials classes, from nanomagnetic systems such as soft magnetic Fe-based nanocomposites, hard magnetic Nd−Fe−B-based permanent magnets, magnetic steels, ferrofluids, nanoparticles, and magnetic oxides, to more fundamental open issues in contemporary condensed matter physics such as skyrmion crystals, noncollinar magnetic structures in noncentrosymmetric compounds, magnetic/electronic phase separation, and vortex lattices in type-II superconductors. Special attention is paid not only to the vast variety of magnetic materials and problems where SANS has provided direct insight, but also to the enormous progress made regarding the micromagnetic simulation of magnetic neutron scattering.

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“…42(b) which leads to RC broadening. Subsequent studies using a time-of-flight approach to SANS yielded consistent results (Pautrat et al, 2012).…”

Section: )mentioning

confidence: 71%

Section: Relating Structural and Dynamic Propertiesmentioning

confidence: 99%

Magnetic small-angle neutron scattering

et al. 2019

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“…In particular, the use of contrast matching 5,19,42,49,99,119 or magnetic scattering 125,127,129,132 has been shown to be a valuable way to optimise experiments by highlighting structures of interest. Throughout the described examples, high importance is placed on the application of SANS alongside other scattering techniques.…”

Section: Discussionmentioning

confidence: 99%

“…130,131 At present, SANS remains unmatched in its ability to do this. 132 Example magnetic scattering data for a sample of tool steel is shown in Fig. 10, which indicates a broad spectrum of particle sizes.…”

Section: Precipitates and Clustersmentioning

confidence: 99%

Practical applications of small-angle neutron scattering

Hollamby

2013

Phys. Chem. Chem. Phys.

120

116

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Recent improvements in beam-line accessibility and technology have led to small-angle neutron scattering (SANS) becoming more frequently applied to materials problems. SANS has been used to study the assembly, dispersion, alignment and mixing of nanoscale condensed matter, as well as to characterise the internal structure of organic thin films, porous structures and inclusions within steel.Using time-resolved SANS, growth mechanisms in materials systems and soft matter phase transitions can also be explored. This review is intended for newcomers to SANS as well as experts. Therefore, the basic knowledge required for its use is first summarised. After this introduction, various examples are given of the types of soft and hard matter that have been studied by SANS. The information that can be extracted from the data is highlighted, alongside the methods used to obtain it. In addition to presenting the findings, explanations are provided on how the SANS measurements were optimised, such as the use of contrast variation to highlight specific parts of a structure. Emphasis is placed on the use of complementary techniques to improve data quality (e.g. using other scattering methods) and the accuracy of data analysis (e.g. using microscopy to separately determine shape and size). This is done with a view to providing guidance on how best to design and analyse future SANS measurements on materials not listed below.

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“…The dominant pinning mechanism in pure Nb is generally surface pinning [26,27] which has no direct relation with a bulk disordering of the lattice [40]. As a consequence, significant critical current can be present without direct relation with vortex disorder due to bulk pinning.…”

Section: Pioneering Magnetic Decoration Experiments Havementioning

confidence: 99%

Temperature dependence of clusters with attracting vortices in superconducting niobium studied by neutron scattering

Pautrat¹,

Brûlet²

2014

J. Phys.: Condens. Matter

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We have investigated the intermediate mixed state of a superconducting niobium sample by Very Small Angle Neutron Scattering. We show that this state is stabilized through a sequence where a regular vortex lattice appears, which then coexists with vortex clusters before vanishing at low temperature. Vortices in clusters have a constant periodicity regardless of the applied field, exhibit a temperature dependence close to the one of the penetration depth. The clusters disappear in the high temperature limit. All the results agree with an explanation in terms of vortex attraction due non local effects, and indicate a negligible role of pinning. Phase coexistence between Abrikosov vortex lattice and vortex clusters is reported showing the first order nature of the boundary line.

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Flux-lines lattice order and critical current studied by time-of-flight small-angle neutron scattering

Cited by 10 publications

References 40 publications

Magnetic small-angle neutron scattering

Magnetic small-angle neutron scattering

Practical applications of small-angle neutron scattering

Temperature dependence of clusters with attracting vortices in superconducting niobium studied by neutron scattering

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