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Charge Carrier Heating Effect in Porous Silicon Structures Investigated by Microwaves

100%
Gradauskas J., Šatkovskis E., Česnys A., Stupakova J., Sužiedėlis A.
Acta Physica Polonica A
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2008
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vol. 113
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issue 3
993-996
EN
Diode-like samples, containing porous silicon structures, were investigated by microwave radiation pulses. The resistance of the samples and electromotive force arising over the samples placed in a section of waveguide was measured. Reduction of resistance of the samples was observed with increase in microwave power. More complicated shape of the electromotive force dependence on pulse power was found. It is shown that both effects could be explained by models based on a concept of carrier heating by microwave radiation.
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Fast Electrical Switching of Thin Manganite Films

73%
Balevičius S., Kiprijanovič O., Stankevič V., Žurauskienė N., Česnys A., Tolvaišienė S., Abrutis A., Plaušinaitienė V.
Acta Physica Polonica A
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2008
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vol. 113
|
issue 3
821-824
EN
The effects of strong pulsed electric field on the electrical properties of thin epitaxial La_{0.7}Sr_{0.3}MnO_3 films were investigated. The fast electrical switching from high resistance off-state to low resistance on-state was obtained at current densities higher than 10^6 A/cm^2. This current was able to induce an irreversible damage of the sample in the regions at the edges of the electrodes of the film. It was demonstrated that thermal effects are responsible for appearance of delay time and asymmetrical shape of current channel in on-state, however, the fast switching from off- to on-state is a result of electronic effects appearing when critical power is reached in the film.
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