Evidence of photogenerated carriers in the semiconducting state of Nd sub(0.67)Sr sub(0.37)MnO sub(3- delta ) epitaxial layers

Time-resolved thermoelectric power measurements on Nd sub(2/3)Sr sub(1 /3)MnO sub(3- delta ) epitaxial layers show a voltage transient which is superimposed to the usual quasistatic thermovoltage decay which is due to heat diffusion, but only in the activated regime. The characteristic temperature o...

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Published inJournal of magnetism and magnetic materials Vol. 196; pp. 484 - 486
Main Authors Liebe, J, Haupt, L, Kattwinkel, A, Hamad, N, Rao, G H, Baerner, K, Gommert, E, Wecker, J, Helmolt, Rv, Braunstein, R, Sun, G S, Medvedeva, I V
Format Journal Article
LanguageEnglish
Published 01.01.1999
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Summary:Time-resolved thermoelectric power measurements on Nd sub(2/3)Sr sub(1 /3)MnO sub(3- delta ) epitaxial layers show a voltage transient which is superimposed to the usual quasistatic thermovoltage decay which is due to heat diffusion, but only in the activated regime. The characteristic temperature of the separation is 140 K. The extra transients are ascribed to the decay of an ambipolar charge distribution in trap states.
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ISSN:0304-8853