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Title: Phase separation and microwave response of epitaxial and polycrystalline manganite films
Authors: Ašmontas, Steponas
Abrutis, Adulfas
Gradauskas, Jonas
Lučun, Andžej
Oginskis, Antanas
Plaušinaitienė, Valentina
Sužiedėlis, Algirdas
Vengalis, Bonifacas
Issue Date: 2004
Publisher: Polish Academy of Sciences
Citation: Ašmontas, S.; Abrutis, A.; Gradauskas, J.; Lučun, A.; Oginskis, A.; Plaušinaitienė, V.; Sužiedėlis, A.; Vengalis, B. 2004. Phase separation and microwave response of epitaxial and polycrystalline manganite films, Acta Physica Polonica A : Proceedings of the Symposium Colossal Magnetoresistance - New Materials and New Ideas (in frames of E-MRS) Warszawa, Poland, September 15-19, 2003. Warszawa : Polish Academy of Sciences..105(1-2): 141-147
Series/Report no.: 105;1-2
Abstract: The resistance, magnetoresistance, and resistance response under microwave irradiation (f=10 and 35GHz) were measured for epitaxial and polycrystalline La 0.67 Ca 0.33 MnO 3 and La 0.67 Sr 0.33 MnO 3 thin films in the temperature range 78÷300K. The microwave induced resistance increase observed for the epitaxial films in a narrow temperature range below the ferromagnetic to paramagnetic transition temperature T c certifies coexistence of low resistance (ferromagnetic) and high resistance (paramagnetic) regions in the manganites. Resistance of polycrystalline films decreased under microwave irradiation in a wide temperature range below T c . The effect was explained in terms of microwave assisted hopping of carriers in high resistance regions formed at grain boundaries of the polycrystalline films.
ISSN: 0587-4246
Appears in Collections:Moksliniai straipsniai / Research articles

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