X-ray and neutron scattering

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Local structures of amorphous and crystalline phases of silica, SiO2, by neutron total scattering

Journal of Physics Condensed Matter IOP Publishing 11:47 (1999) 9263

Authors:

David A Keen, Martin T Dove
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Incommensurate magnetism in non-superconducting PrBa2Cu3O6.92

PHYSICA C 318 (1999) 292-298

Authors:

AT Boothroyd, JP Hill, DF McMorrow, NH Andersen, A Stunault, C Vettier, T Wolf

Abstract:

We report the discovery of incommensurate magnetic order in non-superconducting single crystals PrBa2Cu3O6.92. Resonant X-ray magnetic scattering at the Pr L-II and L-III edges and high resolution neutron diffraction were used to characterise the magnetic order on the different magnetic sublattices. The data reveal that the Pr sublattice orders at a temperature of 19 K in an incommensurate structure with ordering wavevector (0.5 +/- delta, 0.5, 0) or (0.5, 0.5 +/- delta, 0), delta approximate to 0.006-0.008, A spin reorientation in the Pr sublattice to a commensurate antiferromagnetic structure with ordering wavevector (0.5, 0.5, 0.5) takes place at a temperature close to 9 K. (C) 1999 Elsevier Science B.V. All rights reserved.
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Magnetic excitations and pressure studies on single-crystals of PrBa2Cu3O6+x

PHYSICA C 318 (1999) 572-574

Authors:

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

Abstract:

Inelastic neutron scattering measurements have been performed, for the first time, on a large, high quality single-crystal of PrBa2Cu3O6+x. Two relatively broad peaks are observed, the one at lower energy showing significant dispersion in the basal plane. Neither feature is observable above the Pr ordering temperature. The pressure dependence of the Cu and Pr ordering temperatures up to 1.75 GPa has also been determined. (C) 1999 Elsevier Science B.V. All rights reserved.
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Pressure-induced phase transitions in AgCl, AgBr, and AgI

Physical Review B American Physical Society (APS) 59:2 (1999) 750-761

Authors:

S Hull, DA Keen
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Antiferromagnetic ordering states of oxygen-deficient NdBa2Cu3O6+x and Nd1+yBa2-yCu3O6+x single crystals

PHYSICAL REVIEW B 59:5 (1999) 3870-3878

Authors:

E Brecht, P Schweiss, T Wolf, AT Boothroyd, JM Reynolds, NH Andersen, H Lütgemeier, WW Schmahl
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