Damping of spinful excitons in LaCoO.sub.3./sub. by thermal fluctuations: theory and experiment

Hariki, A.; Wang, R-P.; Sotnikov, A.; Tomiyasu, K.; Betto, D.; Brookes, N.B.; Uemura, Y.; Ghiasi, M.; De Groot, F.M.F.; Kuneš, Jan

doi:https://dx.doi.org/10.1103/PhysRevB.101.245162

Number of the records: 1

Damping of spinful excitons in LaCoO.sub.3./sub. by thermal fluctuations: theory and experiment

1.

SYSNO ASEP	0534732
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Damping of spinful excitons in LaCoO₃ by thermal fluctuations: theory and experiment
Author(s)	Hariki, A. (AT) Wang, R-P. (NL) Sotnikov, A. (AT) Tomiyasu, K. (JP) Betto, D. (FR) Brookes, N.B. (FR) Uemura, Y. (NL) Ghiasi, M. (NL) De Groot, F.M.F. (NL) Kuneš, Jan (FZU-D)_{RID, ORCID, SAI}
Number of authors	10
Article number	245162
Source Title	Physical Review B. - : American Physical Society - ISSN 2469-9950 Roč. 101, č. 24 (2020), s. 1-6
Number of pages	6 s.
Language	eng - English
Country	US - United States
Keywords	X-ray-absorption ; electronic-structure ; transition ; state ; limit
Subject RIV	BM - Solid Matter Physics ; Magnetism
OECD category	Condensed matter physics (including formerly solid state physics, supercond.)
Method of publishing	Limited access
Institutional support	FZU-D - RVO:68378271
UT WOS	000543644600005
EID SCOPUS	85094629824
DOI	10.1103/PhysRevB.101.245162
Annotation	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.
Workplace	Institute of Physics
Contact	Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579
Year of Publishing	2021
Electronic address	https://doi.org/10.1103/PhysRevB.101.245162

Number of the records: 1