X-ray and neutron scattering

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Neutron and X-ray scattering studies of magnetism in non-superconducting PrBa2Cu3O6+x

J ALLOY COMPD 303 (2000) 489-497

Abstract:

I give a short review of neutron and X-ray scattering experiments undertaken to study the magnetic properties of non-superconducting PrBa2Cu3O6+x. The measurements have confirmed the magnetic ordering of the Pr sublattice at temperatures below T-Pr approximate to 20 K, and have revealed an incommensurate magnetic structure with a long period (similar to 600 Angstrom) involving both the Pr and Cu spins. The Cu spins in this Pr ordered phase are found to be non-collinear. Taken as a whole, the results provide strong evidence for a substantial magnetic coupling of the pseudodipolar type between the Pr and Cu ions. The effect of this coupling is also evident in the spectrum of low energy magnetic excitations determined by neutron inelastic scattering. (C) 2000 Elsevier Science S.A. All rights reserved.
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Structural characterization of the betatoalpha superionic transition in Ag2HgI4 and Cu2HgI4

Journal of Physics Condensed Matter IOP Publishing 12:16 (2000) 3751

Authors:

S Hull, DA Keen
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Phase transitions in tridymite studied using ‘Rigid Unit Mode’ theory, Reverse Monte Carlo methods and molecular dynamics simulations

Mineralogical Magazine Mineralogical Society 64:2 (2000) 267-283

Authors:

MT Dove, AKA Pryde, DA Keen
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Aspects of the structure and dynamics of the CMR material Nd0.5Pb0.5MnO3

Physica B Condensed Matter Elsevier 276 (2000) 774-775

Authors:

A Mellergård, DA Keen, M Harris, RL McGreevy
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Magnetic excitations of single-crystal PrBa2Cu3O6.2

PHYSICA B 276 (2000) 799-800

Authors:

SJS Lister, AT Boothroyd, NH Andersen, AA Zhokhov, AN Christensen

Abstract:

Measurements of the low-energy magnetic excitations in single-crystal PrBa2Cu3O6.2, and in YBa2Cu3O6.2 for comparison, have been performed using inelastic neutron scattering. An excitation with weak dispersion is seen, which is compared to a spin-wave model based on the lowest lying crystal field levels of the Pr ion, and including the effect of an anisotropic coupling to the Cu magnetic moments, as well as a Pr-Pr exchange interaction. (C) 2000 Elsevier Science B.V. All rights reserved.
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