|Conţinutul numărului revistei|
|Ultima descărcare din IBN:|
| SM ISO690:2012|
MCHALWAT, M.; ULRICHS, Henning; WALOWSKI, Jakob; BALLANI, Camillo; SHAPOVAL, Oleg; MOSHNYAGA, Vasily T.; MUNZENBERG, Markus G.; KONRAD, Samwer. 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, nr. 4(30), p. 0. ISSN 0953-8984.
|Journal of Physics Condensed Matter|
|Numărul 4(30) / 2018 / ISSN 0953-8984 /ISSNe 1361-648X|
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.
correlated polarons, laser excitation, LBMO, LPCMO, manganites, nonlinear electric transport