Laser-induced changes of nonlinear electronic transport properties in La0.75Ba0.25MnO3 and (La0.6Pr0.4)0.67Ca0.33MnO3

We report photoinduced effects in the nonlinear third harmonic ac electric transport-which is a measure for the density of correlated polarons-in thin films of La 0.75 Ba 0.25 MnO 3 (LBMO) and (La 0.6 Pr 0.4 ) 0.67 Ca 0.33 MnO 3 (LPCMO) manganites. Both materials show an enhancement of the third har...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2017-12
Main Authors: Mchalwat, Manuel, Ulrichs, Henning, Walowski, Jakob, Ballani, Camillo, Shapoval, Oleg, Moshnyaga, Vasily, Muenzenberg, Markus, Samwer, Konrad
Format: Article
Language:English
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Summary:We report photoinduced effects in the nonlinear third harmonic ac electric transport-which is a measure for the density of correlated polarons-in thin films of La 0.75 Ba 0.25 MnO 3 (LBMO) and (La 0.6 Pr 0.4 ) 0.67 Ca 0.33 MnO 3 (LPCMO) manganites. Both materials show an enhancement of the 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 the increase (decrease) of the nonlinearity in LBMO (LPCMO). With a high pulse fluence of 8 mJ/cm 2 we were able to suppress the correlations also in LBMO, which is accompanied by a decrease of third harmonic voltage by 2.5 % in our time-averaging measurement technique.
ISSN:1361-648X