Photoinduced formation of ferromagnetic clusters in La0.9Ca0.1MnO3 thin films

Huhtinen Hannu; Laiho Reino; Lähderanta Erkki; Vlasenko Leonid; Vlasenko Marina; Zakhvalinskii Vasilii

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HUHTINEN, Hannu, LAIHO, Reino, LÄHDERANTA, Erkki, VLASENKO, Leonid, VLASENKO, Marina, ZAKHVALINSKII, Vasilii. Photoinduced formation of ferromagnetic clusters in La0.9Ca0.1MnO3 thin films. In: Physical Review B - Condensed Matter and Materials Physics, 2000, vol. 62, pp. 11614 -11618. ISSN 1098-0121. DOI: https://doi.org/10.1103/PhysRevB.62.11614

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Physical Review B - Condensed Matter and Materials Physics

Volumul 62 / 2000 / ISSN 1098-0121 /ISSNe 1550-235X

Photoinduced formation of ferromagnetic clusters in La_0.9Ca_0.1MnO₃ thin films

DOI:https://doi.org/10.1103/PhysRevB.62.11614

Pag. 11614 -11618

Huhtinen Hannu¹, Laiho Reino¹, Lähderanta Erkki¹, Vlasenko Leonid², Vlasenko Marina², Zakhvalinskii Vasilii³

¹ Wihuri Physical Laboratory, University of Turku,
² Ioffe Physical-Technical Institute of the Russian Academy of Sciences i,
³ Institute of Applied Physics, Academy of Sciences of Moldova

Disponibil în IBN: 30 iunie 2023

Rezumat

Microwave losses due to conductivity and magnetic permeability are investigated in La_0.9Ca_0.1MnO₃ films illuminated with photons in the energy range of E=0.5-2 eV. Growth of photoinduced ferromagnetic hysteresis is observed when the magnetic field is swept between -15 and 15 mT at temperatures below 60 K. The time required for saturation of the opening of the hysteresis loop depends on the photon energy having the minimum of ≈40 s at the illumination intensity I=3.5×10¹⁴ photons/cm²s. Both photoinduced magnetization and the increase of microwave photoconductivity can be well explained with a model assuming that small ferromagnetic regions exist within an insulating ferromagnetic phase of the sample and that these regions are expanded by optically induced charge transfer between Jahn-Teller split e_g states of neighboring Mn³⁺ ions.

Cuvinte-cheie
calcium derivative, lanthanum, manganese derivative

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