X-ray and neutron scattering

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Going beyond the dipole approximation to improve the refinement of magnetic structures by neutron diffraction

PHYSICAL REVIEW B 79:14 (2009) ARTN 140405

Authors:

M Rotter, AT Boothroyd
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High-resolution hard x-ray photoemission investigation of La 2-2xSr1+2xMn2O7 (0.30≤x<0.50): Microscopic phase separation and surface electronic structure of a bilayer colossal magnetoresistance manganite

Physical Review B - Condensed Matter and Materials Physics 80:20 (2009)

Authors:

S De Jong, F Massee, Y Huang, M Gorgoi, F Schaefers, J Fink, AT Boothroyd, D Prabhakaran, JB Goedkoop, MS Golden
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Nonthermal Melting of Orbital Order in La1/2Sr3/2MnO4 by Coherent Excitation of a Mn-O Stretching Mode

ULTRAFAST PHENOMENA XVI 92 (2009) 182-184

Authors:

Raanan I Tobey, Dharmalingam Prabhakaran, Andrew T Boothroyd, Andrea Cavalleri
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Structure and superconductivity of LiFeAs.

Chem Commun (Camb) (2008) 5918-5920

Authors:

Michael J Pitcher, Dinah R Parker, Paul Adamson, Sebastian JC Herkelrath, Andrew T Boothroyd, Richard M Ibberson, Michela Brunelli, Simon J Clarke

Abstract:

Lithium iron arsenide phases with compositions close to LiFeAs exhibit superconductivity at temperatures at least as high as 16 K, demonstrating that superconducting [FeAs](-) anionic layers with the anti-PbO structure type occur in at least three different structure types and with a wide range of As-Fe-As bond angles.
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High-energy spin excitations in BaFe2As2 observed by inelastic neutron scattering

Physical Review B - Condensed Matter and Materials Physics 78:22 (2008)

Authors:

RA Ewings, TG Perring, RI Bewley, T Guidi, MJ Pitcher, DR Parker, SJ Clarke, AT Boothroyd

Abstract:

We report neutron-scattering measurements of cooperative spin excitations in antiferromagnetically ordered BaFe2As2, the parent phase of an iron pnictide superconductor. The data extend up to ∼100 meV and show that the spin excitation spectrum is sharp and highly dispersive. By fitting the spectrum to a linear spin-wave model we estimate the magnon bandwidth to be in the region of 0.17 eV. The large characteristic spin-fluctuation energy suggests that magnetism could play a role in the formation of the superconducting state. © 2008 The American Physical Society.
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