X-ray and neutron scattering

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Femtosecond dynamics of the collinear-to-spiral antiferromagnetic phase transition in CuO

(2011)

Authors:

SL Johnson, RA de Souza, U Staub, P Beaud, E Möhr-Vorobeva, G Ingold, A Caviezel, V Scagnoli, WF Schlotter, JJ Turner, O Krupin, W-S Lee, Y-D Chuang, L Patthey, RG Moore, D Lu, M Yi, PS Kirchmann, M Trigo, P Denes, D Doering, Z Hussain, Z-X Shen, D Prabhakaran, AT Boothroyd
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Antiferromagnetic spin fluctuations in LiFeAs observed by neutron scattering

Physical Review B - Condensed Matter and Materials Physics 83:22 (2011)

Authors:

AE Taylor, MJ Pitcher, RA Ewings, TG Perring, SJ Clarke, AT Boothroyd

Abstract:

We report neutron inelastic-scattering measurements on the stoichiometric iron-based superconductor LiFeAs. We find evidence for (i) magnetic scattering consistent with strong antiferromagnetic fluctuations and (ii) an increase in intensity in the superconducting state at low energies, similar to the resonant magnetic excitation observed in other iron-based superconductors. The results do not support a recent theoretical prediction of spin-triplet p-wave superconductivity in LiFeAs but instead suggest that the mechanism of superconductivity is similar to that in the other iron-based superconductors. © 2011 American Physical Society.
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Cu3Nb2O8: a multiferroic with chiral coupling to the crystal structure

(2011)

Authors:

RD Johnson, Sunil Nair, LC Chapon, A Bombardi, C Vecchini, D Prabhakaran, AT Boothroyd, PG Radaelli
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Itinerant spin excitations in SrFe2As2 measured by inelastic neutron scattering

Physical Review B - Condensed Matter and Materials Physics 83:21 (2011)

Authors:

RA Ewings, TG Perring, J Gillett, SD Das, SE Sebastian, AE Taylor, T Guidi, AT Boothroyd

Abstract:

We report inelastic neutron-scattering measurements of the magnetic excitations in SrFe2As2, the parent of a family of iron-based superconductors. The data extend throughout the Brillouin zone and up to energies of ~260 meV. The spectrum calculated from a J1-J 2 model does not accurately describe our data, and we show that some of the qualitative features that the model fails to describe are readily explained by calculations from a five-band itinerant mean-field model. In particular, the high-energy part of the spectra recorded above TN do not differ significantly from those at low temperature, which is explained by the itinerant model and which has implications for theories of electronic nematic and orbital ordering. © 2011 American Physical Society.
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Erratum: Circularly polarized x rays as a probe of noncollinear magnetic order in multiferroic TbMnO3 (Physical Review Letters (2011) 106:23 (239902))

Physical Review Letters 106:23 (2011)

Authors:

F Fabrizi, HC Walker, L Paolasini, F De Bergevin, AT Boothroyd, D Prabhakaran, DF McMorrow
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