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Synchrotron x-ray scattering of magnetic and electronic structure of UN and U2N3 epitaxial films

DOI: 10.1103/PhysRevB.100.134426 DOI Help

Authors: E. Lawrence Bright (University of Bristol) , R. Springell (University of Bristol) , D. G. Porter (Diamond Light Source) , S. P. Collins (Diamond Light Source) , G. H. Lander (University of Bristol)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 100

State: Published (Approved)
Published: October 2019
Diamond Proposal Number(s): 20776

Abstract: We examine the magnetic ordering of UN and of a closely related nitride, U 2 N 3 , by preparing thin epitaxial films and using synchrotron x-ray techniques. The magnetic configuration and subsequent coupling to the lattice are key features of the electronic structure. The well-known antiferromagnetic (AF) ordering of UN is confirmed, but the expected accompanying distortion at T N is not observed. Instead, we propose that the strong magnetoelastic interaction below T N causes substantial changes in the strain in the sample being measured. These strains vary as a function of the sample form. As a consequence, the accepted AF configuration of UN may be incorrect. In the case of cubic α − U 2 N 3 , no single crystals have been previously prepared, and we have determined the AF ordering wave vector. The AF T N is close to that previously reported. In addition, resonant diffraction methods have identified an aspherical quadrupolar charge contribution in U 2 N 3 involving the 5 f electrons.

Journal Keywords: Magnetic order; Physical Systems; Actinides; Single crystal materials; Thin films; Resonant elastic x-ray scattering; X-ray diffraction

Subject Areas: Materials, Physics

Instruments: I16-Materials and Magnetism

Added On: 30/10/2019 15:21

Discipline Tags:

Surfaces Radioactive Materials Physics Hard condensed matter - structures Magnetism Materials Science interfaces and thin films

Technical Tags:

Scattering Resonant Soft X-ray Scattering (RSXS)