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2 edition of Diffraction investigations of topological, chemical and magnetic order in some binary systems. found in the catalog.

Diffraction investigations of topological, chemical and magnetic order in some binary systems.

Gillian Elizabeth Carr

Diffraction investigations of topological, chemical and magnetic order in some binary systems.

by Gillian Elizabeth Carr

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  • 6 Currently reading

Published .
Written in English


Edition Notes

Thesis (Ph.D.) - University of Sheffield, Dept. ;of Physics, 1987.

ID Numbers
Open LibraryOL13960379M

The stability of the magnetic nanocrystals in such POMs/nanocrystals assemblies opens the way to (i) the elaboration of new binary assemblies from POMs and numerous kinds of nanocrystals with a good control on the magnetic properties and to (ii) the investigation of new physical properties as exchange coupling, or magneto-transport in such systems.   For example, it is necessary to classify two-dimensional (2D) electronic systems by their topological invariants determined from their band structures (e.g. Chern number or TKNN number) [20, 21]. In addition, the marriage between topology and symmetry leads to the understanding of a large family of materials with novel physics.

  We have carried out an extensive neutron diffraction investigation of Fe 3 Ga 4 solving, for the first time, the magnetic structure of what had been reported to be an AFM state finding, instead.   We investigated magneto-optical response of undoped Bi2Te3 films in the terahertz frequency range (– THz, 10– cm−1) in magnetic fields up to 10 T. The optical transmission, measured in the Faraday geometry, is dominated by a broad Lorentzian-shaped mode, whose central frequency linearly increases with applied field. In zero field, the Lorentzian is .

Chemical contrast. While topological contrast is readily observed, the properties of the helium probe particle have been predicted to yield weaker, more exotic mechanisms example, the. Liquid Structure Investigation by Neutron Scattering Overview.- The Basic Equations.- Van Hove Scattering Law.- The Static Approximation and the Structure Factor.- Polyatomic Systems and Partial Structure Factors.- Molecular Systems.- Relation Between Structure Factor and Thermodynamics.- Neutron.


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Diffraction investigations of topological, chemical and magnetic order in some binary systems by Gillian Elizabeth Carr Download PDF EPUB FB2

Unlike the long-range order of ideal crystalline structures, local order is an intrinsic characteristic of real materials and often serves as the key to the tuning of their properties and their final applications. Although researchers can easily assess local ordering using two-dimensional imaging techniques with resolution that approaches the atomic level, the diagnosis, description, and Cited by:   We have investigated the chemical and magnetic order of the magnetic semiconductor ZnMn 2 As 2 by powder neutron diffraction.

The chemical structure is different from that previously found from X-ray data, showing the coexistence of a layer fully occupied by Mn ions together with a mixed Mn/Zn bilayer, all layers being perpendicular to the hexagonal by: 4. Neutron and X-ray diffraction experiments have provided useful information about the topological and chemical short-range order in non-crystalline materials.

The availability of new sources and detectors for X-rays and neutrons has greatly improved the statistical accuracy of the scattered intensity and extended its range in momentum (Q Cited by: 3. X-Ray and Neutron Diffraction Experiments on Metallic Glasses J.

Sadoc and C. Wagner With 16 Figures Neutron and x-ray scattering experiments have been extensively employed to. Partial structure factors were inferred from the diffraction data which allow an analysis of both, the topological and the chemical short-range order of these alloy melts as a function of the.

The neutron diffraction (ND) pattern for Nd 7 Rh 3 measured at K is shown in Fig. 1 along with the Rietveld refinement profile and the difference curve. The plot helps in identifying the magnetic and nuclear Bragg peaks.

The Rietveld refinement carried out on this data set shows the nuclear structure (Bragg peaks indicated by the first row of the vertical tick marks), anti-ferromagnetic. which do, in fact, manifest long-range magnetic order at low temperatures [47–51].

Given the chemical simplicity asso-ciated with a binary compound, the matched sets of i-R-Cd and RCd 6 form model systems that should allow us to determine, refine and test our understanding of the key fea-tures and properties associated with quasicrystalline. The topological analysis was performed in order to better understand the connections in the 2D network and determine some correlation with known coordination polymers.

Several binary metal. In all of these systems, for both the Cu magnetic order as well as the lanthanide magnetic order, the spin structures are relatively simple commensurate antiferromagnetic configurations. A Single Crystal Neutron and X-ray Diffraction Investigation, A.

Goldman, A. Kreyssig, K. Prokes, D. Pratt, D. Argyriou, Topological RPdBi. Ag3AsSe3 crystallizes in the trigonal R3c space group.

The structure is three-dimensional. Ag1+ is bonded in a 3-coordinate geometry to three equivalent Se2- atoms. There are a spread of Ag–Se bond distances ranging from – Å.

As3+ is bonded in a distorted trigonal non-coplanar geometry to three equivalent Se2- atoms. All As–Se bond lengths are Å. Artificial chemical and magnetic structure at the domain walls of an epitaxial oxide.

providing mathematical guidance for the investigation of a network of topological defects. topological. A neutron diffraction study of topological and local magnetic order in the amorphous alloy Tb 65 Cu 35 and in particular the short range order existing in some amorphous binary alloys (x-ray.

neutron and electron diffraction, diffraction for atomic and magnetic short range order at. Crystal order is not restricted to the periodic atomic array, but can also be found in electronic systems such as the Wigner crystal or in the form of orbital order, stripe order and magnetic order.

The existence of chemical short range order in Fe-B and Ni-B type amorphous alloys is evident from diffraction experiments 1–4.

Furthermore, the fine details of the first and second neighbour pair distribution suggest different chemical short range order in the two systems.

Fe2B is Khatyrkite structured and crystallizes in the tetragonal I4/mcm space group. The structure is three-dimensional. Fe is bonded in a 4-coordinate geometry to four equivalent B atoms. All Fe–B bond lengths are Å. B is bonded in a coordinate geometry to eight equivalent Fe and two equivalent B atoms.

Both B–B bond lengths are Å. A magnetic field applied parallel to the [1,1,0] direction will have a different effect on the spins located on the two chains.

For describing the induced magnetic order, a subgroup of the F d 3 ¯ m space group, such as Fdd2, needs to be used that allows splitting of the 16d site into two different subsets corresponding to the α and β chains.

Later on Holland-Moritz et al. extended these diffraction techniques to the elastic neutron scattering for investigations on the short-range order of undercooled metallic melts [16, Cer­ tain investigations, however, are difficult or totally impossible to conduct using x-rays, for example, the localization of atomic nuclei or atoms having only a few core electrons, and the observation of magnetic moments.

The investigation of these important areas is made possible by neutron diffraction. From the X-ray diffraction analysis and temperature dependent resistivity, we were able to conclude that the as-grown thin films have ordered chalcogen layers and the chemical potential in these thin films lie in the bulk gap.

Thus the focus has been shifting from the binary three-dimensional topological insulators BS, The ability to. Our work on driving topological edge modes in magnetic materials complements previous investigations in ultracold ga17, photonic crystals 9, and most recently arrays of.

The pseudo-binary alloy systems Ce(Rh/sub 1-x/Ru/sub x/)/sub 2/ and Ce(Rh/sub 1-y/Pt/sub y/)/sub 2/ with 0 less than or equal to x, y less than or equal to 1 were studied. The room temperature lattice constant, the electrical resistivity from to K ( K for some samples), the magnetic susceptibility from 2 to K, and the specific.In physics, topological order is a kind of order in the zero-temperature phase of matter (also known as quantum matter).

Macroscopically, topological order is defined and described by robust ground state degeneracy and quantized non-Abelian geometric phases of degenerate ground states. Microscopically, topological orders correspond to patterns of long-range quantum entanglement.Magnetic materials [1] are rich enough to support complex localized topological structures known as skyrmions [2, 3].

Indeed, depending of the type of material, the localized excitations may appear as isolated structures or as spatially organized arrays or lattices; see, e.g, Refs. [4{11], for theoretical investigations, and Refs.

[12{15] for the.