X-ray and neutron scattering

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Nature of the magnetic order and origin of induced ferroelectricity in TbMnO$_3$

(2009)

Authors:

SB Wilkins, TR Forrest, TAW Beale, SR Bland, HC Walker, D Mannix, F Yakhou, D Prabhakaran, AT Boothroyd, JP Hill, PD Hatton, DF McMorrow
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X-ray resonant scattering study of the magnetic phase diagram of multiferroic TbMnO3

PHYSICA B Elsevir 404:19 (2009) 3264-3266

Authors:

HC Walker, RA Ewings, F Fabrizi, D Mannix, C Mazzoli, SB Wilkins, L Paolasini, D Prabhakaran, AT Boothroyd, DF McMorrow

Abstract:

We present the magnetic phase diagram of multiferroic TbMnO3 for H parallel to b determined using X-ray resonant scattering at the Tb L-3-edge. Investigations of two different magnetic domains, C-type and F-type, demonstrate very similar behaviour in high applied magnetic fields, with a low temperature incommensurate to commensurate transition at H similar or equal to 4.5T, concurrent with the polarisation flop observed in bulk magnetoelectric measurements. (C) 2009 Elsevier B.V. All rights reserved.
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Magnetic order and dynamics of the charge-ordered antiferromagnet La1.5Sr0.5CoO4

Physical Review B American Physical Society (APS) 80:13 (2009) 134414

Authors:

LM Helme, AT Boothroyd, R Coldea, D Prabhakaran, CD Frost, DA Keen, LP Regnault, PG Freeman, M Enderle, J Kulda
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Publisher's Note: Crystal structure of the rhombohedral phase of PbZr1−xTixO3 ceramics at room temperature [Phys. Rev. B 80, 104109 (2009)]

Physical Review B American Physical Society (APS) 80:13 (2009) 139902

Authors:

H Yokota, N Zhang, AE Taylor, PA Thomas, AM Glazer
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Structural studies on Na0.75CoO2 thermoelectric material at high pressures

Solid State Communications 149:39-40 (2009) 1712-1716

Authors:

RS Kumar, S Rekhi, D Prabhakaran, M Somayazulu, E Kim, JD Cook, T Stemmler, AT Boothroyd, MR Chance, AL Cornelius

Abstract:

The crystal structure of Na0.75CoO2 was studied at ambient and low temperatures down to 10 K at pressures up to 40 GPa using synchrotron x-rays and a diamond cell in angle dispersion geometry. A reduction in the c / a ratio was observed at both conditions with the application of pressure. An increase in Co-O bond lengths and a decrease in Na-O bond lengths were observed above 10 GPa. The results of the density functional calculations performed agree well with the pressure induced bond length changes. The anomalous change in the c / a ratio and bond lengths indicate a pressure induced isostructural phase transition above 10 GPa. Bulk modulus calculations show this compound is less compressible than its hydrated analogues. © 2009 Elsevier Ltd.
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