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

Abstract

We have studied the low-temperature ordered phase of Nd 0.5 Sr 0.5 MnO 3 by resonant soft x-ray scattering at the Mn L 2,3 edges. Strong resonances were observed at ͑ 0 1 2 0 ͒ and ͑ 1 2 0 0 ͒ reflections, which are resolved in momentum space. Azimuthal scans reveal a periodicity for both resonances, the minimum intensity being almost zero. The two reflections show a very different energy dependence which extends in the whole energy region of the Mn L-edge. The ͑ 0 1 2 0 ͒ reflection originates from the anisotropy induced on the d-symmetry projected density of states owing to the local tetragonal distortion at one of the two crystallographic inequivalent Mn sites ͑the so-called Mn 3+ ions in the conventional ionic description͒. This is similar to the resonance observed at the Mn K edge. We propose that the ͑ 1 2 0 0 ͒ reflection, which has not its counterpart either on the Mn K-edge resonant scattering or on the magnetic scattering, is originated by anisotropy of the d-symmetry projected density of the so-called Mn 4+ sublattice. In this way, the latter reflection could denote a pure orbital ordering in this sublattice.

Structural changes at the semiconductor-insulator phase transition in the single-layered perovskiteLa0.5Sr1.5MnO4

“…Consequently, a large number of soft RXS studies are mostly interpreted in terms of the e g OO yet. [17][18][19][20][21][22][23][24][25] In light of the latter considerations, we reexamine here the case of the layered La 0.5 Sr 1.5 MnO 4 manganite, which is considered as one of the prototypical compounds displaying a CO-OO state, combining RXS at the Mn K edge and high-resolution synchrotron powder x-ray diffraction.…”

Resonant soft x-ray scattering investigation of orbital and magnetic ordering inLa0.5Sr1.5MnO4

“…This was originally predicted by Goodenough. 9 It should be noted that the picture of integral charge on the Mn ions has recently been challenged, 10 implying that the actual valence difference of the two Mn ions is much less than 1. The assumption that they are close to 3.5+, however, is based on the formal valence and does not take covalency into account, which should cause a reduction; according to Hartree-Fock calculations on the related compound La 0.5 Ca 0.5 MnO 3 ͑Ref.…”

Orbital Ordering Structures in (Nd,Pr)0.5Sr0.5MnO3Manganite Thin Films on Perovskite (011) Substrates

“…In this paper, the results of a structural study of four manganite thin films, 16 an orbital arrangement that cannot be derived from the MnO 6 distortion, the mode of the distortion still provides a lot of information about the orbital as the Q-space that can be measured by L-edge RXS measurements is small.…”