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An investigation of the magnetic structure of PrO2

APPL PHYS A-MATER 74 (2002) S1773-S1775

Authors:

CH Gardiner, AT Boothroyd, SJS Lister, MJ McKelvy, S Hull, BH Larsen

Abstract:

We present a neutron-diffraction study of the crystal structure and magnetic ordering of PrO2. The magnetic moment of the Pr4+ ion is determined from separate single-crystal and powder measurements, and both values are found to agree with a previous powder study. Our powder data reveal a new aspect to the magnetic structure: a doubling of the magnetic unit cell along one crystal axis.
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Dispersive magnetic excitations in non-superconducting PrBa2Cu3O6+x (x approximate to 0.93)

APPL PHYS A-MATER 74 (2002) S898-S900

Authors:

CH Gardiner, SJS Lister, AT Boothroyd, NH Andersen, AA Zhokhov, A Stunault, A Hiess

Abstract:

We report preliminary results of a neutron inelastic scattering study of the magnetic excitations in single-crystal PrBa2Cu3O6+x (x approximate to 0.93). The measurements probe (i) the dispersion of the low-energy crystal field levels of the Pr ion in the low-temperature AFIII magnetic phase and (ii) the Cu optic spin wave mode gap in the AFI magnetic phase. We compare the results with previous measurements made when the same crystal was in an oxygen-deficient state, and thus establish the effect of hole doping on the magnetic excitations.
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The magnetic state of Yb in Kondo-lattice YbNi2B2C

(2002)

Authors:

AT Boothroyd, JP Barratt, P Bonville, PC Canfield, A Murani, AR Wildes, RI Bewley
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Structural disorder and loss of piezoelectric properties in α-quartz at high temperature

Applied Physics Letters AIP Publishing 81:16 (2002) 2968-2970

Authors:

J Haines, O Cambon, DA Keen, MG Tucker, MT Dove
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Disordering phenomena in superionic conductors

Journal of Physics Condensed Matter IOP Publishing 14:32 (2002) r819
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