Optical signatures of strain-induced ferromagnetism in a LaCoO3 thin film

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dc.contributor.authorAbadizaman, Farzincs
dc.contributor.authorMunzar, Dominikcs
dc.contributor.authorKiaba, Michalcs
dc.contributor.authorDubroka, Adamcs
dc.coverage.issue23cs
dc.coverage.volume110cs
dc.date.accessioned2025-06-10T09:56:30Z
dc.date.available2025-06-10T09:56:30Z
dc.date.issued2024-12-24cs
dc.description.abstractUsing spectroscopic ellipsometry, we studied the optical conductivity of LaCoO3 with various degrees of strain. The optical response of the compressively strained LaCoO3 film is qualitatively similar to the one of the unstrained LaCoO3 polycrystalline sample and exhibits a redistribution of the spectral weight between '0.2 and 6 eV, which is most likely related to the thermal excitation of the high-spin (HS) states. The optical response of the ferromagnetic (FM) tensile strained film exhibits clear signatures of the FM state. Below the Curie temperature Tc = 82 K, a spectral weight transfer sets on from high energies (between 3.3 and 5.6 eV) to low energies (between 0.2 and 3.3 eV). The temperature dependence of the low-energy spectral weight can be understood in the framework of the HS biexciton model of Sotnikov et al. [SciPost Phys. 8, 082 (2020)] as corresponding to the increase of the concentration of the HS states that are stabilized below Tc. The magnitude of the redistribution of the spectral weight due to the formation of the FM state is sizable and corresponds to 0.009 e per Co ion. We discuss it in terms of the effective kinetic energy of Co 3d bands.en
dc.formattextcs
dc.format.extent235151-1-235151-8cs
dc.format.mimetypeapplication/pdfcs
dc.identifier.citationPHYSICAL REVIEW B. 2024, vol. 110, issue 23, p. 235151-1-235151-8.en
dc.identifier.doi10.1103/PhysRevB.110.235151cs
dc.identifier.issn2469-9969cs
dc.identifier.other197258cs
dc.identifier.urihttps://hdl.handle.net/11012/251589
dc.language.isoencs
dc.publisherAMER PHYSICAL SOCcs
dc.relation.ispartofPHYSICAL REVIEW Bcs
dc.relation.urihttps://journals.aps.org/prb/abstract/10.1103/PhysRevB.110.235151cs
dc.rightsCreative Commons Attribution 4.0 Internationalcs
dc.rights.accessopenAccesscs
dc.rights.sherpahttp://www.sherpa.ac.uk/romeo/issn/2469-9969/cs
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/cs
dc.subjectTRANSITIONen
dc.subjectSPINen
dc.subjectTEMPERATUREen
dc.titleOptical signatures of strain-induced ferromagnetism in a LaCoO3 thin filmen
dc.type.driverarticleen
dc.type.statusPeer-revieweden
dc.type.versionpublishedVersionen
eprints.grantNumberinfo:eu-repo/grantAgreement/MSM/EH/EH22_008/0004572cs
sync.item.dbidVAV-197258en
sync.item.dbtypeVAVen
sync.item.insts2025.06.10 11:56:30en
sync.item.modts2025.06.10 11:33:32en
thesis.grantorVysoké učení technické v Brně. Středoevropský technologický institut VUT. Příprava a charakterizace nanostrukturcs
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Příprava a charakterizace nanostruktur