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Dresden 2017 – scientific programme

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MA: Fachverband Magnetismus

MA 68: Poster 5

MA 68.6: Poster

Friday, March 24, 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 L2,3-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 L2,3 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).

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