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Phonon dispersion relations in PrBa2 Cu3 Q 6+x (x ≈ 0.2)

Physical Review B Condensed Matter and Materials Physics 69:9 (2004) 923021-923024

Authors:

CH Gardiner, AT Boothroyd, BH Larsen, W Reichardt, AA Zhokhov, NH Andersen, SJS Lister, AR Wildes

Abstract:

We report measurements of the phonon dispersion relations in nonsuperconducting, oxygen-deficient PrBa2Cu3O 6+x (x ≈ 0.2) by inelastic neutron scattering. The data are compared with a model of the lattice dynamics based on a common interatomic potential. Good agreement is achieved for all but two phonon branches, which are significantly softer than predicted. These modes are found to arise predominantly from motion of the oxygen ions in the CuO2 planes. Analogous modes in YBa2Cu3O6 are well described by the common interatomic potential model.

Magnetic excitations in La1.5Sr0.5CoO4

Physica B Elsevier 350 (2004) e273-e275

Authors:

LM Helme, AT Boothroyd, D Prabhakaran, FR Wondre, CD Frost, J Kulda

Abstract:

We report magnetization and neutron scattering measurements of the half-doped compound La1.5Sr0.5CoO4, which exhibits a checkerboard pattern of charge ordering below not, vert, similar800 K. In the antiferromagnetically-ordered phase below not, vert, similar40 K the spins are found to be canted in the ab plane. The spin excitation spectrum includes spin-wave excitations with a maximum energy of 16 meV, and diffuse magnetic modes at energies around 30 meV.
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Phonon dispersion relations in PrBa2Cu3O6+x (x≈0.2) - art. no. 092302

PHYSICAL REVIEW B 69:9 (2004) ARTN 092302

Authors:

CH Gardiner, AT Boothroyd, BH Larsen, W Reichardt, AA Zhokhov, NH Andersen, SJS Lister, AR Wildes
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Resonant soft energy X-ray diffraction of charge, spin and orbital ordering

ADV SOLID STATE PHYS 44 (2004) 467-478

Authors:

PD Hatton, SB Wilkins, TAW Beale, T Johal, P Bencok, D Prabhakaran, AT Boothroyd
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Ferromagnetic in-plane spin fluctuations in NaxCoO2 observed by neutron inelastic scattering

(2003)

Authors:

AT Boothroyd, R Coldea, DA Tennant, D Prabhakaran, LM Helme, CD Frost
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