X-Ray Resonance Exchange Scattering

Resonant x-ray scattering study of magnetic-dipole and electric-quadrupole order inU0.75Np0.25O2

“…4 and 5). They arise from the F [2] term in the RXS cross section 25,26 and have also been observed in the work we reported on high-order terms in multi−k structures. 31 The strong similarity between these signals and those found 17 in pure NpO 2 suggests that in NpO 2 as well the principle RXS signal arises from a quadrupole signal, and not a more complicated process, as suggested recently.…”

“…Resonant X-ray Scattering (RXS) occurs when a photon is virtually absorbed by exciting a core electron to empty states, and subsequently re-emitted when the excited electron and the core hole recombine 25,26 . This process introduces anisotropic contributions to the X-ray susceptibility tensor 27 , the amplitude of which increases dramatically as the photon energy is tuned to an atomic absorption edge.…”

Soft X-Ray Resonant Magnetic Diffraction

“…Away from the L II and L III resonances, the magnetic peak was unobservable due to its very low intensity. Such a large resonant enhancement has been predicted qualitatively [16]. The different spectral shape observed in this resonance as opposed to that of the Bragg peak is most probably due to the electronic structure of the 3d band being split due to the effects of Jahn-Teller distortions of the Mn octahedra and the structure factor of the (001) being only sensitive to the Mn ions.…”

EuTiO3magnetic structure studied by neutron powder diffraction and resonant x-ray scattering

“…To understand the origin of the x-ray resonant magnetic cross section, it is customary to use the expression first derived by Hannon and Trammel for an electric dipole (E1) event: [46][47][48] …”