Abstract
We present Co L3-edge resonant inelastic X-ray scattering (RIXS) of bulk LaCoO3 across the thermally induced spin-state crossover around 100 K. Owing to a high energy resolution of 25 meV, we observe unambiguously the dispersion of the intermediate-spin (IS) excitations in the low-temperature regime. Approaching the intermediate temperature regime, the IS excitations are damped and the bandwidth is reduced. The observed behavior can be well described by a model of mobile IS excitons with strong attractive interaction, which we solve by using dynamical mean-field theory for hard-core bosons. Our results provide a detailed mechanism of how high-spin and IS excitations interact to establish the physical properties of cobaltite perovskites.
| Original language | English |
|---|---|
| Article number | 245162 |
| Number of pages | 6 |
| Journal | Physical Review B |
| Volume | 101 |
| Issue number | 24 |
| DOIs | |
| Publication status | Published - 15 Jun 2020 |
Bibliographical note
Funding Information:The authors acknowledge A. Kauch, J. Fernández Afonso, D. J. Huang, and J. Okamoto for valuable discussions. The authors thank M. van der Linden and F. Frati for their support in RIXS experiment. A.H., A.S., and J.K. are supported by the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (Grant Agreement No. 646807-EXMAG). The experiments were supported by an ERC advanced grant (Grant Agreement No. 340279-XRAYonACTIVE). K.T. was financially supported by the MEXT and JSPS KAKENHI (Grants No. JP17H06137 and No. JP18K03503). The calculations were performed on the Vienna Scientific Cluster (VSC).
Publisher Copyright:
© 2020 American Physical Society.
Funding
The authors acknowledge A. Kauch, J. Fernández Afonso, D. J. Huang, and J. Okamoto for valuable discussions. The authors thank M. van der Linden and F. Frati for their support in RIXS experiment. A.H., A.S., and J.K. are supported by the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (Grant Agreement No. 646807-EXMAG). The experiments were supported by an ERC advanced grant (Grant Agreement No. 340279-XRAYonACTIVE). K.T. was financially supported by the MEXT and JSPS KAKENHI (Grants No. JP17H06137 and No. JP18K03503). The calculations were performed on the Vienna Scientific Cluster (VSC).