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Depth-resolved resonant inelastic x-ray scattering at a superconductor/half-metallic-ferromagnet interface through standing wave excitation

  • Author(s): Kuo, CT
  • Lin, SC
  • Ghiringhelli, G
  • Peng, Y
  • De Luca, GM
  • Di Castro, D
  • Betto, D
  • Gehlmann, M
  • Wijnands, T
  • Huijben, M
  • Meyer-Ilse, J
  • Gullikson, E
  • Kortright, JB
  • Vailionis, A
  • Gauquelin, N
  • Verbeeck, J
  • Gerber, T
  • Balestrino, G
  • Brookes, NB
  • Braicovich, L
  • Fadley, CS
  • et al.
Abstract

© 2018 American Physical Society. We demonstrate that combining standing wave (SW) excitation with resonant inelastic x-ray scattering (RIXS) can lead to depth resolution and interface sensitivity for studying orbital and magnetic excitations in correlated oxide heterostructures. SW-RIXS has been applied to multilayer heterostructures consisting of a superconductor La1.85Sr0.15CuO4 (LSCO) and a half-metallic ferromagnet La0.67Sr0.33MnO3 (LSMO). Easily observable SW effects on the RIXS excitations were found in these LSCO/LSMO multilayers. In addition, we observe different depth distribution of the RIXS excitations. The magnetic excitations are found to arise from the LSCO/LSMO interfaces, and there is also a suggestion that one of the dd excitations comes from the interfaces. SW-RIXS measurements of correlated-oxide and other multilayer heterostructures should provide unique layer-resolved insights concerning their orbital and magnetic excitations, as well as a challenge for RIXS theory to specifically deal with interface effects.

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