Ferromagnetism of LaCoO$_3$ films

Sotnikov, Andrii; Ahn, Kyo-Hoon; Kuneš, Jan

doi:10.21468/SciPostPhys.8.6.082

SciPost Physics

Ferromagnetism of LaCoO$_3$ films

Andrii Sotnikov, Kyo-Hoon Ahn, Jan Kuneš

SciPost Phys. 8, 082 (2020) · published 2 June 2020

doi: 10.21468/SciPostPhys.8.6.082
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Abstract

We study ferromagnetic ordering and microscopic inhomogeneity in tensile strained LaCoO$_3$ using numerical simulations. We argue that both phenomena originate from effective superexchange interactions between atoms in the high-spin (HS) state mediated by the intermediate-spin excitations. We derive a model of the HS excitation as a bare atomic state dressed by electron and electron-hole fluctuations on the neighbor atoms. We construct a series of approximations to account for electron correlation effects responsible for HS fluctuations and magnetic exchange. The obtained amplitudes and directional dependence of magnetic couplings between the "dressed" HS states show a qualitative agreement with experimental observations and provide a new physical picture of LaCoO$_3$ films.

This publication has been updated

Correction: Ferromagnetism of LaCoO$_3$ films on 2021-03-10

TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhys.8.6.082
TI  - Ferromagnetism of LaCoO$_3$ films
PY  - 2020/06/02
UR  - https://scipost.org/SciPostPhys.8.6.082
JF  - SciPost Physics
JA  - SciPost Phys.
VL  - 8
IS  - 6
SP  - 082
A1  - Sotnikov, Andrii
AU  - Ahn, Kyo-Hoon
AU  - Kuneš, Jan
AB  - We study ferromagnetic ordering and microscopic inhomogeneity in tensile strained LaCoO$_3$ using numerical simulations. We argue that both phenomena originate from effective superexchange interactions between atoms in the high-spin (HS) state mediated by the intermediate-spin excitations. We derive a model of the HS excitation as a bare atomic state dressed by electron and electron-hole fluctuations on the neighbor atoms. We construct a series of approximations to account for electron correlation effects responsible for HS fluctuations and magnetic exchange. The obtained amplitudes and directional dependence of magnetic couplings between the "dressed" HS states show a qualitative agreement with experimental observations and provide a new physical picture of LaCoO$_3$ films.
ER  -

@Article{10.21468/SciPostPhys.8.6.082,
	title={{Ferromagnetism of LaCoO$_3$ films}},
	author={Andrii Sotnikov and Kyo-Hoon Ahn and Jan Kuneš},
	journal={SciPost Phys.},
	volume={8},
	pages={082},
	year={2020},
	publisher={SciPost},
	doi={10.21468/SciPostPhys.8.6.082},
	url={https://scipost.org/10.21468/SciPostPhys.8.6.082},
}

Cited by 4

Ontology / Topics

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Ferromagnetic thin films

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¹ ² Andrii Sotnikov,
¹ ³ Kyo-Hoon Ahn,
¹ ⁴ Jan Kuneš

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