X-ray and neutron scattering

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Direct measurement of the thermal expansion of the Si-O bond by neutron total scattering

Journal of Physics Condensed Matter IOP Publishing 12:26 (2000) l425

Authors:

Matthew G Tucker, Martin T Dove, David A Keen
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Amorphous silica from the Rigid Unit Mode approach

Mineralogical Magazine Mineralogical Society 64:3 (2000) 377-388

Authors:

MT Dove, KD Hammonds, MJ Harris, V Heine, A Keen, AKA Pryde, K Trachenko, MC Warren
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Crystal structure of the high-pressure monoclinic phase-II of cristobalite, SiO2

Mineralogical Magazine Mineralogical Society 64:3 (2000) 569-576

Authors:

MT Dove, MS Craig, DA Keen, WG Marshall, SAT Redfern, KO Trachenko, MG Tucker
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Total scattering studies of silica polymorphs: similarities in glass and disordered crystalline local structure

Mineralogical Magazine Mineralogical Society 64:3 (2000) 447-457

Authors:

DA Keen, MT Dove
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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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