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

作者：Mchalwat M^*; Ulrichs H; Walowski J; Ballani C; Shapoval O; IVioshnyaga V; Muenzenberg M^*; Samwer K

来源：Journal of Physics: Condensed Matter , 2018, 30(4): 045701.

DOI：10.1088/1361-648X/aa9fa1

• manganites
• LBMO
• LPCMO
• nonlinear electric transport
• laser excitation
• correlated polarons

We report photoinduced effects in nonlinear third hannonic ac electric transport-which is a measure for the density of con-elated polarons-in thin films of La0.75Ba0.25MnO3 (LBMO) and (La0.6Pr0.4)(0.67)Ca0.33MnO3 (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 mu J 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 hannonic voltage by 2.5% in our time-averaging measurement technique.

• 出版日期2018-1-31
• 单位中国科学院电工研究所