X-ray and neutron scattering

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Ferromagnetic Excitations in La$_{0.82}$Sr$_{0.18}$CoO$_{3}$ Observed Using Neutron Inelastic Scattering

(2010)

Authors:

RA Ewings, PG Freeman, M Enderle, J Kulda, D Prabhakaran, AT Boothroyd
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Antiferromagnetically spin polarized oxygen observed in magneto-electric TbMn2O5

(2010)

Authors:

TAW Beale, SB Wilkins, RD Johnson, SR Bland, Y Joly, TR Forrest, DF McMorrow, F Yakhou, D Prabhakaran, AT Boothroyd, PD Hatton
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Metal Ion Roles and the Movement of Hydrogen during Reaction Catalyzed by D-Xylose Isomerase: A Joint X-Ray and Neutron Diffraction Study

Structure Elsevier 18:6 (2010) 688-699

Authors:

Andrey Y Kovalevsky, Leif Hanson, S Zoe Fisher, Marat Mustyakimov, Sax A Mason, V Trevor Forsyth, Matthew P Blakeley, David A Keen, Trixie Wagner, HL Carrell, Amy K Katz, Jenny P Glusker, Paul Langan
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Nanoporous Structure and Medium-Range Order in Synthetic Amorphous Calcium Carbonate

Chemistry of Materials American Chemical Society (ACS) 22:10 (2010) 3197-3205

Authors:

Andrew L Goodwin, F Marc Michel, Brian L Phillips, David A Keen, Martin T Dove, Richard J Reeder
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Magnetic excitations of Fe(1+y)Se(x)Te(1-x) in magnetic and superconductive phases.

J Phys Condens Matter 22:14 (2010) 142202

Authors:

P Babkevich, M Bendele, AT Boothroyd, K Conder, SN Gvasaliya, R Khasanov, E Pomjakushina, B Roessli

Abstract:

We have used inelastic neutron scattering and muon-spin rotation to compare the low energy magnetic excitations in single crystals of superconducting Fe(1.01)Se(0.50)Te(0.50) and non-superconducting Fe(1.10)Se(0.25)Te(0.75). We confirm the existence of a spin resonance in the superconducting phase of Fe(1.01)Se(0.50)Te(0.50), at an energy of 7 meV and a wavevector of (1/2, 1/2, 0). The non-superconducting sample exhibits two incommensurate magnetic excitations at (1/2, 1/2, 0) ± (0.18, - 0.18, 0) which rise steeply in energy, but no resonance is observed at low energies. A strongly dispersive low energy magnetic excitation is also observed in Fe(1.10)Se(0.25)Te(0.75) close to the commensurate antiferromagnetic ordering wavevector (1/2 - δ, 0, 1/2), where δ≈0.03. The magnetic correlations in both samples are found to be quasi-two-dimensional in character and persist well above the magnetic (Fe(1.10)Se(0.25)Te(0.75)) and superconducting (Fe(1.01)Se(0.50)Te(0.50)) transition temperatures.
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