X-ray and neutron scattering

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Erratum: Electric field control of chiral magnetic domains in the high-temperature multiferroic CuO [Phys. Rev. B 85, 134428 (2012)]

Physical Review B American Physical Society (APS) 86:1 (2012) 019905

Authors:

P Babkevich, A Poole, RD Johnson, B Roessli, D Prabhakaran, AT Boothroyd
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On the magnetic structure of Sr3Ir2O7: an x-ray resonant scattering study

(2012)

Authors:

S Boseggia, R Springell, HC Walker, AT Boothroyd, D Prabhakaran, SP Collins, DF McMorrow
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Growth of LiNb 1-xTa xO 3 solid solution crystals

Materials Chemistry and Physics 134:2-3 (2012) 728-735

Authors:

A Bartasyte, AM Glazer, F Wondre, D Prabhakaran, PA Thomas, S Huband, DS Keeble, S Margueron

Abstract:

The growth of single crystals of solid solutions of LiNbO 3 and LiTaO 3 has been studied by using a number of different techniques: Czochralski pulling, Top-Seeded Solution Growth, flux growth from LiBO 2 and LiVO 3, and by optical floating zone. Crystals with homogenous Li, Ta and Nb compositions were obtained by several techniques. Analysis of local and average compositions of Ta, Nb and Li by Raman spectroscopy, birefringence imaging and X-ray diffraction, in addition to EDAX, is described. The effects of replacing Nb by Ta and of Li non-stoichiometry on the lattice parameters and the compositional disorder over the whole composition range 0 ≤ x ≤ 1 are discussed. © 2012 Elsevier B.V. All rights reserved.
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Advances in the understanding of multiferroics through soft X-ray diffraction

European Physical Journal: Special Topics 208:1 (2012) 99-106

Authors:

TAW Beale, SB Wilkins, RD Johnson, D Prabhakaran, AT Boothroyd, P Steadman, SS Dhesi, PD Hatton

Abstract:

The magneto-electric multiferroic TbMn 2O 5 has a complex magnetic structure in three different magnetically ordered phases. We have determined the nature of the induced magnetic order on the oxygen sites in the commensurate magnetic phase through full linear X-ray polarisation analysis at the oxygen K edge. This has been achieved rotating the linear polarisation of the incident beam at the source, and using multilayers to analyse the polarisation state of the scattered X-ray beam. We have confirmed that the anisotropy of the magnetic scattering at the oxygen edge is consistent with the anisotropy of the manganese magnetic structure. © 2012 EDP Sciences, Springer-Verlag.
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Dynamical matrix diagonalization for the calculation of dispersive excitations.

J Phys Condens Matter 24:21 (2012) 213201

Authors:

Martin Rotter, Manh Duc Le, Andrew T Boothroyd, Jesus Angel Blanco

Abstract:

The solid state exhibits a fascinating variety of phases, which can be stabilized by the variation of external parameters such as temperature, magnetic field and pressure. Until recently, numerical analysis of magnetic and/or orbital phases with collective excitations on a periodic lattice tended to be done on a case-by-case basis. Nowadays dynamical matrix diagonalization (DMD) has become an important and powerful standard method for the calculation of dispersive modes. The application of DMD to the interpretation of inelastic neutron scattering (INS) data on dispersive magnetic excitations is reviewed. A methodical survey of calculations employing spin-orbit and intermediate coupling schemes is illustrated by examples. These are taken from recent work on rare earth, actinide and transition metal compounds and demonstrate the application of the formalism developed.
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