dd excitations in bilayer manganites probed by resonant inelastic x-ray scattering

F. Weber, S. Rosenkranz, J.-P. Castellan, R. Osborn, J. F. Mitchell, H. Zheng, D. Casa, J. H. Kim, and T. Gog
Phys. Rev. B 82, 085105 – Published 10 August 2010

Abstract

We report a high-resolution resonant inelastic x-ray scattering investigation of the bilayer manganites La22xSr1+2xMn2O7 with x=0.36 and 0.5. The momentum dependence along the crystallographic (110) direction for energy losses 1eVΔE15eV has been measured in detail with the data analysis focusing on the energy-loss region 1eVΔE5eV, which includes a strong peak located at ΔE2eV. We observe a clear dispersion of up to 0.5 eV in the measured q range, which is direct evidence of the nonlocal character of this excitation. Further, we found that the intensity in this low-energy region strongly depends on both the reduced wave vector q=(h,h,0), h=0.10.5, and temperature, i.e., different ordered phases. Results can be explained via an intersite dd charge-transfer excitation, proposed for pseudocubic manganites, where the hopping rate is strongly increased (decreased) by ferromagnetic (antiferromagnetic) alignment of neighboring in-plane Mn ion core spins.

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  • Received 5 May 2010

DOI:https://doi.org/10.1103/PhysRevB.82.085105

©2010 American Physical Society

Authors & Affiliations

F. Weber1,*, S. Rosenkranz1, J.-P. Castellan1, R. Osborn1, J. F. Mitchell1, H. Zheng1, D. Casa2, J. H. Kim2, and T. Gog2

  • 1Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
  • 2Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA

  • *Present address: Karlsruhe Institute of Technology, Institute of Solid State Physics, P.O. Box 3640, D-76021 Karlsruhe, Germany; frank.weber@kit.edu

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Vol. 82, Iss. 8 — 15 August 2010

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