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 SM ISO690:2012MCHALWAT, M., ULRICHS, Henning, WALOWSKI, Jakob, BALLANI, Camillo, SHAPOVAL, Oleg M., MOSHNYAGA, Vasily T., MUNZENBERG, Markus G., SAMWER, Konrad H.. Laser-induced changes of nonlinear electronic transport properties in La0.75Ba0.25MnO3 and (La0.6Pr0.4)0.67Ca0.33MnO3. In: Journal of Physics Condensed Matter, 2018, vol. 30, p. 0. ISSN 0953-8984. DOI: https://doi.org/10.1088/1361-648X/aa9fa1 |
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  Journal of Physics Condensed Matter |
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| Volumul 30 / 2018 / ISSN 0953-8984 /ISSNe 1361-648X | |
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| DOI:https://doi.org/10.1088/1361-648X/aa9fa1 | |
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| Rezumat | |
We report photoinduced effects in nonlinear third harmonic ac electric transport-which is a measure for the density of correlated polarons-in thin films of La0.75Ba0.25MnO3 (LBMO) and (La0.6Pr0.4)0.67Ca0.33MnO3 (LPCMO) manganites. Both materials show an enhancement of third harmonic voltage in the vicinity of the metal-to-insulator transition, indicating strong electron-lattice correlations within a phase-separated state. Relatively low laser excitation with a pulse fluence of 11 μJ cm-2 leads to an increase (decrease) in nonlinearity in LBMO (LPCMO). With a high pulse fluence of 8mJ cm-2, we were also able to suppress the correlations in LBMO, which is accompanied by a decrease of third harmonic voltage by 2.5% in our time-averaging measurement technique. |
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| Cuvinte-cheie correlated polarons, laser excitation, LBMO, LPCMO, manganites, nonlinear electric transport |
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