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

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26620%2F24%3APU155955" target="_blank" >RIV/00216305:26620/24:PU155955 - isvavai.cz</a>
Alternative codes found
RIV/00216224:14310/24:00138574
Result on the web
<a href="https://journals.aps.org/prb/abstract/10.1103/PhysRevB.110.235151" target="_blank" >https://journals.aps.org/prb/abstract/10.1103/PhysRevB.110.235151</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevB.110.235151" target="_blank" >10.1103/PhysRevB.110.235151</a>

Result language
angličtina
Original language name
Optical signatures of strain-induced ferromagnetism in a LaCoO3 thin film
Original language description
Using 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.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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