Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-06-12
J. Phys.: Condens. Matter 21 265402 (2009)
Physics
Condensed Matter
Strongly Correlated Electrons
12 pages
Scientific paper
10.1088/0953-8984/21/26/265402
'Forbidden' Bragg reflections of iron orthoborate Fe3BO6 were studied theoretically and experimentally in the vicinity of the iron K edge. Their energy spectra are explained as resulting from the interference of x-rays scattered from two inequivalent crystallographic sites occupied by iron ions. This particular structure property gives rise to complex azimuthal dependences of the reflection intensities in the pre-edge region as they result from the interplay of site specific dipole-quadrupole and quadrupole-quadrupole resonant scattering. Also evidenced is an isotropic character of the absorption spectrum. Self-absorption correction to the diffraction data, as well as possible contributions of thermal vibrations and magnetic order, are discussed. Particular care is given to extracting clean spectra from the data, and it is demonstrated that excellent results can be obtained even from measurements that appear corrupted by several effects such as poor crystal quality and multiple scattering.
Antonenko A. A.
Beutier G.
Bombardi A.
Collins S. P.
Dmitrienko Vladimir E.
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