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Beyreuther, Elke
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Publications (5/5 displayed)
- 2024Probing Ferroelectric Phase Transitions in Barium Titanate Single Crystals via in-situ Second Harmonic Generation Microscopy
- 2015Conductivity and magnetoresistance of La0.7Ce0.3MnO3-δ thin films under photoexcitationcitations
- 2014The Mn2+/Mn3+ state of La0.7Ce 0.3MnO3 by oxygen reduction and photodopingcitations
- 2007Photon-assisted spectroscopy of electronic interface states in perovskite oxide heterostructures
- 2005Surface photovoltage spectroscopy for the investigation of perovskite oxide interfacescitations
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article
Conductivity and magnetoresistance of La0.7Ce0.3MnO3-δ thin films under photoexcitation
Abstract
<p>La<sub>0.7</sub>Ce<sub>0.3</sub>MnO<sub>3</sub> thin films of different thicknesses, degrees of CeO<sub>2</sub>-phase segregation and oxygen deficiency, grown on SrTiO<sub>3</sub> single crystal substrates, were comparatively investigated with respect to both their spectral and temperature-dependent photoconductivity (PC) and their magnetoresistance (MR) behaviour under photoexcitation. While as-grown films were insensitive to optical excitation, oxygen reduction appeared to be an effective way to decrease the film resistance, but the film thickness was found to play a minor role. However, from the evaluation of the spectral behaviour of the PC and the comparison of the MR of the LCeMO/substrate-samples with a bare substrate under illumination we find that the photoconductivity data reflects not only contributions from (i) photogenerated charge carriers in the film and (ii) carriers injected from the photoconductive substrate (as concluded from earlier works), but also (iii) a decisive parallel photoconduction in the SrTiO<sub>3</sub> substrate. Furthermore - also by analyzing the MR characteristics - the unexpected occurence of a strong electroresistive effect in the sample with the highest degree of CeO<sub>2</sub> segregation and oxygen deficiency could be attributed to the electroresistance of the SrTiO<sub>3</sub> substrate as well. The results suggest a critical reconsideration and possibly a reinterpretation of several previous photoconductivity and electroresistance investigations of manganite thin films on SrTiO<sub>3</sub>.</p>