Emergence of Quasi-Long-Range Order below the Bragg Glass Transition

Daniilidis, N. D.; Park, S. R.; Dimitrov, Ivo; Lynn, J. W.; Ling, Xinsheng

doi:10.1103/physrevlett.99.147007

Cited by 16 publications

(14 citation statements)

References 22 publications

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“…As already discussed, energy barriers may trap the VL in disordered metastable configurations when cooling from the normal state in a constant field. In addition to a transport current or an AC field, an ordering of the VL can in some cases be achieved by a simple thermal cycling (Daniilidis et al, 2007;Marziali Bermudez et al, 2017). Conversely, the application of a field oscillation will introduce an edge "contamination" of the VL at surfaces where vortices enter and leave the sample (Hanson et al, 2011).…”

Section: Relating Structural and Dynamic Propertiesmentioning

confidence: 99%

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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Section: Relating Structural and Dynamic Propertiesmentioning

confidence: 99%

Magnetic small-angle neutron scattering

et al. 2019

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“…The computed function slightly overestimates the width of the actual resolution function. For example, the rocking curves of an ordered FLL in niobium, obtained under the conditions introduced in our calculation, have half width of 1.2 mrad (Daniilidis et al, 2007), which is approximately 87% of the width of the numerical integration result (1.38 mrad). This discrepancy is a result of the assumptions made in our calculation.…”

Section: Numerical Evaluation Of the Resolution Functionmentioning

confidence: 74%

“…We performed SANS rocking-curve measurements on an FLL in a niobium single crystal on the NG-3 instrument at NCNR-NIST. The experimental findings are reported in detail elsewhere (Daniilidis et al, 2007). Here we compute the resolution function starting from the instrumental configuration and compare the result with experimentally obtained curves which are at the resolution limit.…”

Section: Numerical Evaluation Of the Resolution Functionmentioning

confidence: 91%

Ewald construction and resolution function for rocking-curve small-angle neutron scattering experiments

2007

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A geometrical Ewald construction for small-angle neutron scattering experiments from line-like objects with a preferential orientation of the lines, such as flux-line lattices in type-II superconductors, is described. The Ewald construction offers a straightforward way to interpret rocking-curve experiments. It allows calculation of the resolution function in rocking-curve measurements. The resolution function for a given instrumental geometry can be readily computed by performing two numerical integrations. Figure 1Scattering geometry in SANS measurements. The sample and magnetic field (thus, the flux-line lattice) are rotated by ! with respect to the incident neutron beam. The diffracted neutrons satisfy the Bragg condition at angles B .

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“…Since the vortex lattice is embedded in an atomic lattice, neutron scattering (Furrer et al, 2009) is the only technique for direct structural studies. There have been several attempts (Klein et al, 2001;Daniilidis et al, 2007;Laver et al, 2008) to observe the Bragg glass phase, but no conclusive evidence has been found even though there are compelling arguments (Klein et al, 2001) for why one would not be able to measure it directly.…”

Section: Introductionmentioning

confidence: 99%

“…In particular, the vortex states in bulk Nb samples have been studied extensively (Schelten et al, 1971;Christen et al, 1977;Rosov et al, 1994;Ling et al, 2001;Forgan et al, 2002;Daniilidis et al, 2007;Laver et al, 2008). These small-angle neutron scattering (SANS) measurements revealed the bulk properties of the interior of the samples.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional spatially resolved neutron diffraction from a disordered vortex lattice

et al. 2011

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The vortex matter in bulk type II superconductors serves as a prototype system for studying the random pinning problem in condensed matter physics. Since the vortex lattice is embedded in an atomic lattice, small‐angle neutron scattering (SANS) is the only technique that allows for direct structural studies. In traditional SANS methods, the scattering intensity is a measure of the structure factor averaged over the entire sample. Recent studies in vortex physics have shown that it is highly desirable to develop a SANS technique that is capable of resolving the spatial inhomogeneities in the bulk vortex state. This article reports a novel slicing neutron diffraction technique using atypical collimation and an areal detector, which allows for observing the three‐dimensional disorder of the vortex matter inside an as‐grown Nb single crystal.

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Emergence of Quasi-Long-Range Order below the Bragg Glass Transition

Cited by 16 publications

References 22 publications

Magnetic small-angle neutron scattering

Magnetic small-angle neutron scattering

Ewald construction and resolution function for rocking-curve small-angle neutron scattering experiments

Three-dimensional spatially resolved neutron diffraction from a disordered vortex lattice

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