Andrew Boothroyd: Publications

Textbook

Principles of Neutron Scattering from Condensed Matter

Published by Oxford University Press in July 2020

Magnetic excitations in multiferroic LuMnO3 studied by inelastic neutron scattering

Physical Review B Condensed Matter and Materials Physics 82:18 (2010)

Authors:

HJ Lewtas, AT Boothroyd, M Rotter, D Prabhakaran, H Müller, MD Le, B Roessli, J Gavilano, P Bourges

Abstract:

We present data on the magnetic and magnetoelastic coupling in the hexagonal multiferroic manganite LuMnO3 from inelastic neutron scattering, magnetization, and thermal-expansion measurements. We measured the magnon dispersion along the main symmetry directions and used this data to determine the principal exchange parameters from a spin-wave model. An analysis of the magnetic anisotropy in terms of the crystal field acting on the Mn is presented. We compare the results for LuMnO3 with data on other hexagonal R MnO3 compounds. © 2010 The American Physical Society.

Itinerant Spin Excitations in SrFe2As2 Measured by Inelastic Neutron Scattering

(2010)

Authors:

RA Ewings, TG Perring, J Gillett, SD Das, SE Sebastian, AE Taylor, T Guidi, AT Boothroyd

Spin anisotropy of the resonance in superconducting FeSe0.5Te0.5

(2010)

Authors:

P Babkevich, B Roessli, SN Gvasaliya, L-P Regnault, PG Freeman, E Pomjakushina, K Conder, AT Boothroyd

Tuning the superconducting and magnetic properties in Fe_ySe_0.25Te_0.75 by varying the Fe-content

(2010)

Authors:

M Bendele, P Babkevich, S Katrych, SN Gvasaliya, E Pomjakushina, K Conder, B Roessli, AT Boothroyd, R Khasanov, H Keller

Ferromagnetic excitations in La0.82Sr0.18CoO 3 observed using neutron inelastic scattering

Physical Review B Condensed Matter and Materials Physics 82:14 (2010)

Authors:

RA Ewings, PG Freeman, M Enderle, J Kulda, D Prabhakaran, AT Boothroyd

Abstract:

Polarized neutron inelastic scattering has been used to measure spin excitations in ferromagnetic La0.82Sr0.18CoO3. The magnon spectrum of these spin excitations is well defined at low energies but becomes heavily damped at higher energies and can be modeled using a quadratic dispersion. We determined a spin wave stiffness constant of D=94±3 meV Å2. Assuming a nearest-neighbor Heisenberg model we find reasonable agreement between the exchange determined from D and the bulk Curie temperature. Several possible mechanisms to account for the observed spin-wave damping are discussed. © 2010 The American Physical Society.

51��