X-ray and neutron scattering

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The J_{eff}=1/2 insulator Sr3Ir2O7 studied by means of angle-resolved photoemission spectroscopy

(2012)

Authors:

BM Wojek, MH Berntsen, S Boseggia, AT Boothroyd, D Prabhakaran, DF McMorrow, HM Rønnow, J Chang, O Tjernberg
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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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Magnetic structure of DyMn 2O 5 determined by resonant x-ray scattering

Physical Review B - Condensed Matter and Materials Physics 85:22 (2012)

Authors:

GE Johnstone, RA Ewings, RD Johnson, C Mazzoli, HC Walker, AT Boothroyd

Abstract:

Resonant magnetic x-ray scattering has been used to investigate the magnetic structure of the magnetoelectric multiferroic DyMn 2O 5. We have studied the magnetic structure in the ferroelectric phase of this material, which displays the strongest ferroelectric polarization and magnetodielectric effect of the RMn 2O 5 (where R is a rare-earth ion, Y or Bi) family. The magnetic structure observed is similar to that of the other members of the series, but differs in the direction of the ordered moments. In DyMn 2O 5, both the Dy and Mn moments lie close to the b axis, whereas in other RMn 2O 5 they lie close to the a axis. © 2012 American Physical Society.
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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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X-ray diffraction study of the temperature-induced structural phase transitions in SmVO3

Physical Review B - Condensed Matter and Materials Physics 85:22 (2012)

Authors:

RD Johnson, CC Tang, IR Evans, SR Bland, DG Free, TAW Beale, PD Hatton, L Bouchenoire, D Prabhakaran, AT Boothroyd

Abstract:

Through powder x-ray diffraction we have investigated the structural behavior of SmVO 3, in which orbital and magnetic degrees of freedom are believed to be closely coupled to the crystal lattice. We have found, contrary to previous reports, that SmVO 3 exists in a single, monoclinic phase below 200 K. The associated crystallographic distortion is then stabilized through the magnetostriction that occurs below 134 K. The crystal structure has been refined using synchrotron x-ray powder diffraction data measured throughout the structural phase diagram, showing a substantial Jahn-Teller distortion of the VO 6 octahedra in the monoclinic phase, compatible with the expected G-type orbital order. Changes in the vanadium ion crystal field due to the structural and magnetic transitions have then been probed by resonant x-ray diffraction. © 2012 American Physical Society.
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