X-ray and neutron scattering

Research group

Research theme

Sub department

About

Application of the reverse Monte Carlo method to crystalline materials

Journal of Applied Crystallography International Union of Crystallography (IUCr) 34:5 (2001) 630-638

Authors:

Matthew G Tucker, Martin T Dove, David A Keen
More details from the publisher

Comment on "magnetoelastic model for the relaxation of lanthanide ions in YBa2Cu3O7-δ observed by neutron scattering"

Physical Review B Condensed Matter and Materials Physics 64:6 (2001) 665011-665014

Abstract:

Lovesey and Staub have argued [S.W. Lovesey and U. Staub, Phys. Rev. B 61, 9130 (2000)] that experimental data on the temperature dependence of the paramagnetic relaxation of lanthanide ions doped into YBa2Cu3O6+x are in agreement with the predictions of a model that describes the relaxation as due to the scattering of phonons via a magnetoelastic interaction. By generalizing their model I show that the level of agreement is strongly dependent on the number of intermediate lanthanide energy levels included in the calculation, and that inclusion of a more complete set of levels leads to very different results that do not necessarily support the phonon damping picture.

A detailed structural characterization of quartz on heating through the α−β phase transition

Mineralogical Magazine Mineralogical Society 65:4 (2001) 489-507

Authors:

MG Tucker, DA Keen, T Dove
More details from the publisher

An X-ray and Neutron Scattering Study of the Structure of Zinc Vanadate Glasses

Zeitschrift für Naturforschung A De Gruyter 56:6-7 (2001) 478-488

Authors:

Uwe Hoppe, Rainer Kranold, Emil Gattef, Jörg Neuefeind, David A Keen
More details from the publisher

Coupled magnetic excitations in single crystal PrBa(2)Cu(3)O(6.2).

Phys Rev Lett 86:26 Pt 1 (2001) 5994-5997

Authors:

SJ Lister, AT Boothroyd, NH Andersen, BH Larsen, AA Zhokhov, AN Christensen, AR Wildes

Abstract:

The dispersion of the low-energy magnetic excitations of the Pr sublattice in PrBa(2)Cu(3)O(6.2) is determined by inelastic neutron scattering measurements on a single crystal. The dispersion, which shows the effect of interactions with the Cu spin waves, is well described by a model of the coupled Cu-Pr magnetic system. This model enables values for the principal exchange constants to be determined. The results suggest that both Pr-Pr and Cu-Pr interactions are important in producing the anomalously high ordering temperature of the Pr sublattice. Measurements of the Cu optic spin wave mode show that the interlayer Cu-Cu exchange is significantly lower than in YBa(2)Cu(3)O(6.2).
More details from the publisher
More details
Details from ArXiV