Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 68: Poster 5

MA 68.6: Poster

Freitag, 24. März 2017, 09:30–13:00, P2-OG4

Resonant inelastic X-ray scattering study of excitonic condensation in perovskite cobalt oxides — •Atsushi Hariki and Jan Kuneš — Institute of Solid State Physics, TU Wien, 1040 Vienna, Austria

Spin-state transition in perovskite cobalt oxides, such as LaCoO₃, is an open problem in the research of the strongly correlated electron systems. Recently, the instability towards the excitonic condensation (EC) close to the spin-state transition was theoretically studied [1,2]. However, experimental probe to detect the EC in perovskite cobalt oxides has not been realized so far.

In this study, we propose that Co L_2,3-edge resonant inelastic X-ray scattering (RIXS) is a promising experimental method to investigate the EC in perovskite cobalt oxides. We analyze the angular dependence of L_2,3 RIXS by means of an atomic model considering the effect of the EC and show that RIXS gives a distinctive spectral feature of the EC state in comparison with the contributions of the pure (atomic) spin-states (such as high-, low- and intermediate-spin states) discussed in the context of the spin-state transition so far.
[1] J. Kuneš et al., Phys. Rev. B 89, 115134 (2014).

[2] J. Kuneš et al., Phys. Rev. B 90, 235112 (2014).