Electric current-induced giant electroresistance in La_(0.36)Pr_(0.265)Ca_(0.375)MnO_3 thin films |
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| Institution: | 1.Beijing Key Laboratory for Magneto-Photoelectrical Composite and Interface Science, School of Mathematics and Physics, University of Science and Technology Beijing, Beijing 100083, China;2.Department of Physics and State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University, Beijing 100084, China;3.Collaborative Innovation Center of Quantum Matter, Beijing 100084, China |
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| Abstract: | The electroresistance (ER) of La0.36Pr0.265Ca0.375MnO3 (LPCMO) epitaxial thin film was studied under various dc currents. The current effect was compared for the unpatterned film and patterned microbridge with a width of 50 μm. The value of ER in the unpatterned LPCMO film could reach 0.54 under a 1-mA current, which is much higher than ER under 1 mA for the patterned weak phase-separated La0.67Ca0.33MnO3 and La0.85Sr0.15MnO3 microbridges with 50-μm width. More interestingly, for the patterned LPCMO microbridge, the maximum of ER can reach 0.6 under a small current of 100 μA. The results were explained by considering the coexistence of ferromagnetic metallic phase with the charge-ordered phase, and the variation of the phase separation with electric current. |
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| Keywords: | manganites electroresistance phase separation percolation |
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