Publications (20)
Negative thermal expansion and antiferromagnetism in the actinide oxypnictide NpFeAsO
T. Klimczuk, H. C. Walker, R. Springell +12
A neptunium analogue of the LaFeAsO tetragonal layered compound has been synthesized and characterized by a variety of experimental techniques. The occurrence of long-range magneti…
X-ray magnetic circular dichroism experiments and theory of transuranium Laves phase compounds
F. Wilhelm, R. Eloirdi, J. Rusz +7
The actinide cubic Laves compounds NpAl2, NpOs2, NpFe2, and PuFe2 have been examined by X-ray magnetic circular dichroism (XMCD) at the actinide M4,5 absorption edges and Os L2,3 a…
Epitaxial UN and -UN Thin Films
E. Lawrence Bright, S. Rennie, M. Cattelan +3
Single crystal epitaxial thin films of UN and UN have been grown for the first time by reactive DC magnetron sputtering. These films provide ideal samples for fundamental r…
The malleability of uranium: manipulating the charge-density wave in epitaxial films
R. Springell, R. C. C. Ward, J. Bouchet +6
We report x-ray synchrotron experiments on epitaxial films of uranium, deposited on niobium and tungsten seed layers. Despite similar lattice parameters for these refractory metals…
Profile of the U 5f magnetization in U/Fe multilayers
S. D. Brown, L. Bouchenoire, P. Thompson +10
Recent calculations, concerning the magnetism of uranium in the U/Fe multilayer system have described the spatial dependence of the 5f polarization that might be expected. We have…
A review of uranium-based thin films
R. Springell, E. Lawrence Bright, D. A. Chaney +4
Thin films based on silicon and transition-metal elements dominate the semiconducting industry and are ubiquitous in all modern devices. Films have also been produced in the rare-e…
Robustness of basal-plane antiferromagnetic order and the state in single-layer iridate spin-orbit Mott insulators
S. Boseggia, R. Springell, H. C. Walker +6
The magnetic structure and electronic groundstate of the layered perovskite Ba2IrO4 have been investigated using x-ray resonant magnetic scattering (XRMS). Our results are compared…
Comparing the Corrosion of Uranium Nitride and Uranium Dioxide Surfaces with H2O2
E. Lawrence Bright, S. Rennie, A. Siberry +4
Uranium mononitride, UN, is considered a potential accident tolerant fuel due to its high uranium density, high thermal conductivity, and high melting point. Compared with the rela…
Study of phonons in irradiated epitaxial thin films of UO
S. Rennie, E. Lawrence Bright, J. E. Darnbrough +6
We report experiments to determine the effect of radiation damage on the phonon spectra of the most common nuclear fuel, UO. We have irradiated thin ( 300 nm) epitaxial f…
The importance of XY anisotropy in Sr2IrO4 revealed by magnetic critical scattering experiments
J. G. Vale, S. Boseggia, H. C. Walker +9
The magnetic critical scattering in SrIrO has been characterized using X-ray resonant magnetic scattering (XRMS) both below and above the 3D antiferromagnetic ordering temp…
Structural properties of epitaxial α-U thin films on Ti, Zr, W and Nb
R. Nicholls, D. A. Chaney, G. H. Lander +2
Thin layers of orthorhombic uranium (α-U) have been grown onto buffered sapphire substrates by d.c. magnetron sputtering, resulting in the discovery of new epitaxial matches to Ti…
The Role of Crystal Orientation in the Dissolution of UO Thin Films
S. Rennie, E. Lawrence Bright, J. E. Sutcliffe +5
Epitaxial thin films have been utilised to investigate the radiolytic dissolution of uranium dioxide interfaces. Thin films of UO deposited on single crystal yttria stabilised…
Magnetic anisotropy in Fe/U and Ni/U bilayers
E. R. Gilroy, M. -H. Wu, M. Gradhand +2
Magnetometry measurements of Fe/U and Ni/U bilayer systems reveal a non-monotonic dependence of the magnetic anisotropy for U thicknesses in the range 0 nm - 8 nm, with the Fe/U bi…
Synchrotron x-ray scattering of UN and U2N3 epitaxial films
E. Lawrence Bright, R. Springell, D. G. Porter +2
We examine the magnetic ordering of UN and of a closely related nitride, U2N3, by preparing thin epitaxial films and using synchrotron x-ray techniques. The magnetic configuration…
Slaving of the magnetic moment canting to the correlated oxygen rotation in Sr2IrO4 revealed by X-ray resonant scattering
S. Boseggia, H. C. Walker, J. Vale +6
Sr2IrO4 is a prototype of the class of Mott insulators in the strong spin-orbit interaction (SOI) limit described by a ground state. In Sr2IrO4, the strong S…
Bulk properties and electronic structure of PuFeAsO
T. Klimczuk, A. B. Shick, R. Springell +7
Here we present bulk property measurements and electronic structure calculations for PuFeAsO, an actinide analogue of the iron-based rare-earth superconductors RFeAsO. Magnetic sus…
Tuneable Correlated Disorder in Alloys
D. Chaney, A. Castellano, A. Bosak +8
Understanding the role of disorder and the correlations that exist within it, is one of the defining challenges in contemporary materials science. However, there are few material s…
Anisotropic Resonant Scattering from uranium systems at the U M4 edge
E. Lawrence Bright, E. N. Ovchinnikova, L. M. Harding +5
We have conducted a series of scattering experiments at the uranium M4 absorption edge on low-symmetry uranium compounds (U2N3 and U3O8) produced as epitaxial films. At weak and fo…
Interaction between U/UO2 bilayers and hydrogen studied by in-situ X-ray diffraction
J. Ed Darnbrough, R. M. Harker, I Griffiths +3
This paper reports experiments investigating the reaction of H with uranium metal-oxide bilayers. The bilayers consist of 100 nm of epitaxial -U (grown on a Nb buf…
Antiferromagnetic order and domains in Sr3Ir2O7 probed by x-ray resonant scattering
S. Boseggia, R. Springell, H. C. Walker +6
This article reports a detailed x-ray resonant scattering study of the bilayer iridate compound, Sr3Ir2O7, at the Ir L2 and L3 edges. Resonant scattering at the Ir L3 edge has been…