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MA: Fachverband Magnetismus
MA 6: Complex Magnetic Oxides
MA 6.3: Vortrag
Montag, 5. September 2022, 11:30–11:45, H37
Strain-induced ferromagnetism in LaCoO3 thin film — •Farzin Abadizaman, Michal Kiaba, and Adam Dubroka — Department of Condensed Matter Physics, Faculty of Science, Masaryk University, Kotlářská 2, 611 37 Brno, Czech Republic.
Ellipsometry measurements were performed on unstrained, tensile strained, and compressive strained LaCoO3 thin films. Only the tensile strained sample shows ferromagnetism, which has a Currie temperature of about 85 K. Using the differential optical conductivity, δσ1 = σ1 (T) − σ1 (T=7 K), we find that in the tensile strain sample, while the spectral weight Neff=2mV/πe2 ∫σ1(ω),dω below 3.5 eV decreases with decreasing temperature in the paramagnetic phase, it starts increasing in the ferromagnetic phase below the transition temperature. This is the first time that the ferromagnetism in this material is observed via optical measurements, and we interpret the results as stabilization of the high-spin state in the ferromagnetic phase associated with transition of spectral weight from higher to lower energy region.