X-ray and neutron scattering

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High energy spin excitations in BaFe2As2

(2008)

Authors:

RA Ewings, TG Perring, RI Bewley, T Guidi, MJ Pitcher, DR Parker, SJ Clarke, AT Boothroyd
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Structure and superconductivity of LiFeAs

(2008)

Authors:

Michael J Pitcher, Dinah R Parker, Paul Adamson, Sebastian JC Herkelrath, Andrew T Boothroyd, Simon J Clarke
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Argentophilicity-Dependent Colossal Thermal Expansion in Extended Prussian Blue Analogues

Journal of the American Chemical Society American Chemical Society (ACS) 130:30 (2008) 9660-9661

Authors:

Andrew L Goodwin, David A Keen, Matthew G Tucker, Martin T Dove, Lars Peters, John SO Evans
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Local structure in Ag3[Co(CN)6]: colossal thermal expansion, rigid unit modes and argentophilic interactions

Journal of Physics Condensed Matter IOP Publishing 20:25 (2008) 255225

Authors:

Michael J Conterio, Andrew L Goodwin, Matthew G Tucker, David A Keen, Martin T Dove, Lars Peters, John SO Evans
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Low-energy collective dynamics of charge stripes in the doped nickelate La2-x Srx Ni O4+δ observed with optical conductivity measurements

Physical Review B - Condensed Matter and Materials Physics 77:19 (2008)

Authors:

J Lloyd-Hughes, D Prabhakaran, AT Boothroyd, MB Johnston

Abstract:

We have investigated charge dynamics in the static stripe ordered phase of La2-x Srx Ni O4+δ at lattice temperatures below the charge ordering transition, via optical conductivity measurements at low energies (1-10 meV). The thermally activated dynamic response of the charge stripes is found to be characteristic of a collective mode such as a pinned charge density wave. At incommensurate doping levels, the pinning energy is reduced, owing to the presence of real-space defects in the stripe order, and a pronounced increase in the oscillator strength is seen. The results provide compelling evidence for the existence of low-energy collective modes of the charge stripes. © 2008 The American Physical Society.
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