Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 47: Poster Session Correlated Electrons 2

TT 47.15: Poster

Mittwoch, 18. März 2020, 15:00–19:00, P2/3OG

Hard-core bosonic dynamical mean-field study on melting of excitonic dispersion in LaCoO3 — •Atsushi Hariki1, Ru-Pan Wang2, Andrii Sotnikov1,3, Keisuke Tomiyasu4, Davide Betto5, Nicholas B. Brookes5, Yohei Uemura2, Mahnaz Ghiasi2, Frank M. F. de Groot2, and Jan Kuneš1,61Institute of Solid State Physics, TU Wien, 1040 Vienna, Austria — 2Debye Institute for Nanomaterials Science, Utrecht University, Universiteitsweg 99, 3584 CG Utrecht, The Netherlands — 3Akhiezer Institute for Theoretical Physics, NSC KIPT, Akademichna 1, 61108 Kharkiv, Ukraine — 4Department of Physics, Tohoku University, Aoba, Sendai 980-8578, Japan — 5European Synchrotron Radiation Facility, 71 Avenue des Martyrs, CS40220, F-38043 Grenoble Cedex 9, France — 6Institute of Physics, Czech Academy of Sciences, Na Slovance 2, 182 21 Praha 8, Czechia

We study excitonic nature of the spin-state transition in LaCoO3. Based on Co L3-edge resonant inelastic x-ray scattering (RIXS) data, we construct an effective bosonic model which describes (i) intermediate-spin (S=1, IS) excitons propagating on a low-spin (S=0) background and (ii) a high-spin (S=2, HS) state as tightly-bound two IS excitons. The effective model is solved at finite temperatures by means of hard-core bosonic dynamical mean-field theory (HB-DMFT). The RIXS data across the spin-state transition around 100K reveals melting of the IS excitonic dispersion. The HB-DMFT analysis of the RIXS data points out a novel picture of the HS state as bi-exciton dressed by virtual fluctuations HS↔IS+IS.

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