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Bergeson, J D; Prigodin, V N; Lincoln, D M; Epstein, A J
Physical review letters, 02/2008, Letnik: 100, Številka: 6Journal Article
We report that organic semiconductors such as alpha-sexithiophene (alpha-6T) have magnetoresistance (MR) with unexpected sign changes; depending on applied voltage, temperature, and layer thickness, the resistance may either increase or decrease upon application of a small magnetic field (<100 mT). We propose that MR and the inversion of MR are due to the role of hyperfine interaction in a magnetic field, as illustrated by the recombination-limited regime.
