Transport and magnetoresistance effect in an oxygen-deficient SrTiO 3/La0.67Sr0.33MnO3 heterojunction

Jing Wang, Chang Le Chen, Shi Hai Yang, Bing Cheng Luo, Meng Meng Duan, Ke Xin Jin

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摘要

An oxygen-deficient SrTiO3/La0.67Sr 0.33MnO3 heterojunction is fabricated on an SrTiO 3 (001) substrate by a pulsed laser deposition method. The electrical characteristics of the heterojunction are studied systematically in a temperature range from 80 K to 300 K. The transport mechanism follows I ∝ exp(eV/nkT) under small forward bias, while it becomes space charge limited and follows I ∝ Vm(T) with 1.49 < m < 1.99 under high bias. Such a heterojunction also exhibits magnetoresistance (MR) effect. The absolute value of negative MR monotonically increases with temperature decreasing and reaches 26.7% at 80 K under H = 0.7 T. Various factors, such as strain and oxygen deficiency play dominant roles in the characteristics.

源语言英语
文章编号127302
期刊Chinese Physics B
22
12
DOI
出版状态已出版 - 12月 2013

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