Transport and magnetoresistance effect in an oxygen-deficient SrTiO3/La0.67Sr0.33MnO3 heterojunction

doi:10.1088/1674-1056/22/12/127302

Abstract An oxygen-deficient SrTiO₃/La_0.67Sr_0.33MnO₃ heterojunction is fabricated on an SrTiO₃ (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 ∝ V^m(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.

Keywords: semiconductors multilayer structure electrical properties magnetoresistance

Received: 26 February 2013
Revised: 18 April 2013
Accepted manuscript online:

PACS:	73.40.Lq	(Other semiconductor-to-semiconductor contacts, p-n junctions, and heterojunctions)
	73.43.Qt	(Magnetoresistance)
	73.40.Ei	(Rectification)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 61078057, 51172183, and 51202195), the Natural Science Foundation of Shaanxi Province, China (Grant No. 2012JQ8013), the Aviation Foundation of China (Grant No. 2011ZF53065), and the Foundation for Fundamental Research of Northwestern Polytechnical University (NPU), China (Grant Nos. JC201155, JC201271, and JC20120246).

Corresponding Authors: Chen Chang-Le
E-mail: chenchl@nwpu.edu.cn

Cite this article:

Wang Jing (王晶), Chen Chang-Le (陈长乐), Yang Shi-Hai (杨世海), Luo Bing-Cheng (罗炳成), Duan Meng-Meng (段萌萌), Jin Ke-Xin (金克新) Transport and magnetoresistance effect in an oxygen-deficient SrTiO₃/La_0.67Sr_0.33MnO₃ heterojunction 2013 Chin. Phys. B 22 127302

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Transport and magnetoresistance effect in an oxygen-deficient SrTiO3/La0.67Sr0.33MnO3 heterojunction

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Transport and magnetoresistance effect in an oxygen-deficient SrTiO₃/La_0.67Sr_0.33MnO₃ heterojunction