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2004 | 105 | 1-2 | 141-147
Article title

Phase Separation and Microwave Response of Epitaxial and Polycrystalline Manganite Films

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EN
Abstracts
EN
The resistance, magnetoresistance, and resistance response under microwave irradiation (f=10 and 35 GHz) 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÷300 K. 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.
Keywords
EN
Contributors
author
  • Semiconductor Physics Institute, A. Goštauto 11, 2600 Vilnius, Lithuania
  • KTU Panevėžys Institute, Klaipėdos 3, 5319 Panevėžys, Lithuania
author
  • Department of General and Inorganic Chemistry, Vilnius University, Naugarduko 24, 2006 Vilnius, Lithuania
author
  • Semiconductor Physics Institute, A. Goštauto 11, 2600 Vilnius
  • Vilnius Gediminas Technical University, Saulėtekio al. 11, 2040 Vilnius, Lithuania
author
  • Semiconductor Physics Institute, A. Goštauto 11, 2600 Vilnius, Lithuania
author
  • Semiconductor Physics Institute, A. Goštauto 11, 2600 Vilnius, Lithuania
  • Department of General and Inorganic Chemistry, Vilnius University, Naugarduko 24, 2006 Vilnius, Lithuania
  • Semiconductor Physics Institute, A. Goštauto 11, 2600 Vilnius
  • Semiconductor Physics Institute, A. Goštauto 11, 2600 Vilnius
  • Vilnius Gediminas Technical University, Saulėtekio al. 11, 2040 Vilnius, Lithuania
author
  • Semiconductor Physics Institute, A. Goštauto 11, 2600 Vilnius
  • Vilnius Gediminas Technical University, Saulėtekio al. 11, 2040 Vilnius, Lithuania
References
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Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.bwnjournal-article-appv105n119kz
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