Orbital ordering in the manganites: Resonant x-ray scattering predictions at the manganeseLIIandLIII

Abstract

It is proposed that the observation of orbital ordering in manganite materials should be possible at the L II and L III edges of manganese using x-ray resonant scattering. If performed, dipole selection rules would make the measurements much more direct than the disputed observations at the manganese K edge. They would yield specific information about the type and mechanism of the ordering not available at the K edge, as well as permitting the effects of orbital ordering and Jahn-Teller ordering to be detected and distinguished from one another. Predictions are presented based on atomic multiplet calculations, indicating distinctive dependence on energy, as well as on polarization and on the azimuthal angle around the scattering vector.

Role of magnetic and orbital ordering at the metal-insulator transition inNdNiO3

“…The 3d states are directly probed by the dipole 2p to 3d transitions (L edges), leading to very strong enhancements in the scattered intensity, independent of the Jahn-Teller distortion. 13 Recently, the first successful resonant soft x-ray scattering experiments on magnetic and orbital ordering in bulk materials were presented. [14][15][16][17] In this report, we present a resonant soft x-ray scattering study on the (1/2 0 1/2) reflection of an epitaxial film of NdNiO 3 .…”

Double stripe ordering inNd0.5Sr0.5MnO3determined by resonant soft x-ray scattering

“…7 shows the comparison between the resonant spectrum and the square of the derivative of the absorption spectrum which can be considered as a first approximation as an energy shift. Several attempts 25,36 have been made to reproduce the experimental RXS spectrum at the L 2,3 edge in other halfdoped manganites, but all of them use the atomic multiplet approach from a perfect ionic ordering, i.e., the anisotropy comes from the ordering of 3d orbitals of Mn 3+ ions. However, we have shown in our Mn K edge study that the charge segregation is too small for considering the approach of an integer valence at the Mn atoms as valid.…”

“…However, this approach is quite rough and could give rise to an overinterpretation of the RSXS results as a direct probe of OO. 25 For the sake of comparison with previous surveys, we will maintain the term OO in the sense of d anisotropy of the local electronic density of empty states. Furthermore, RSXS has also been used to study the magnetic structure in these materials.…”

The contribution of Diamond Light Source to the study of strongly correlated electron systems and complex magnetic structures

“…Furthermore, the energy dependence of the diffraction peak intensity can be used to understand the interactions responsible for spin and orbital ordering [94][95][96][97][98][99]. The extension of RSXD into the ultrafast regime employs a pump-probe approach combining optical excitation with an X-ray probe.…”