Electric current-induced giant electroresistance in La0.36Pr0.265Ca0.375MnO3 thin films

doi:10.1088/1674-1056/26/4/047103

Abstract

The electroresistance (ER) of La_0.36Pr_0.265Ca_0.375MnO₃ (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 La_0.67Ca_0.33MnO₃ and La_0.85Sr_0.15MnO₃ 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.

Keywords: manganites electroresistance phase separation percolation

Received: 27 December 2016
Revised: 22 January 2017
Accepted manuscript online:

PACS:	71.30.+h	(Metal-insulator transitions and other electronic transitions)
	64.75.St	(Phase separation and segregation in thin films)
	75.47.Lx	(Magnetic oxides)
	73.50.-h	(Electronic transport phenomena in thin films)

Fund:

Project supported by the National Natural Science Foundation of China (Grant No. 11604010), the Fundamental Research Funds for the Central Universities, China (Grant No. FRF-TP-15-097A1), and the Open Research Fund Program of the State Key Laboratory of Low-Dimensional Quantum Physics, China (Grant No. KF201611).

Corresponding Authors: Rongming Wang
E-mail: rmwang@ustb.edu.cn

Cite this article:

Yinghui Sun(孙颖慧), Yonggang Zhao(赵永刚), Rongming Wang(王荣明) Electric current-induced giant electroresistance in La_0.36Pr_0.265Ca_0.375MnO₃ thin films 2017 Chin. Phys. B 26 047103

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Electric current-induced giant electroresistance in La0.36Pr0.265Ca0.375MnO3 thin films

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Electric current-induced giant electroresistance in La_0.36Pr_0.265Ca_0.375MnO₃ thin films