Chin. Phys. B ›› 2013, Vol. 22 ›› Issue (12): 127302-127302.doi: 10.1088/1674-1056/22/12/127302

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

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

王晶a b, 陈长乐a, 杨世海a, 罗炳成a, 段萌萌a, 金克新a   

  1. a Shaanxi Key Laboratory of Condensed Matter Structures and Properties, School of Science, Northwestern Polytechnical University, Xi’an 710072, China;
    b College of Physics and Electronic Engineering, Weinan Normal University, Weinan 714000, China
  • 收稿日期:2013-02-26 修回日期:2013-04-18 出版日期:2013-10-25 发布日期:2013-10-25
  • 基金资助:
    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).

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

Wang Jing (王晶)a b, Chen Chang-Le (陈长乐)a, Yang Shi-Hai (杨世海)a, Luo Bing-Cheng (罗炳成)a, Duan Meng-Meng (段萌萌)a, Jin Ke-Xin (金克新)a   

  1. a Shaanxi Key Laboratory of Condensed Matter Structures and Properties, School of Science, Northwestern Polytechnical University, Xi’an 710072, China;
    b College of Physics and Electronic Engineering, Weinan Normal University, Weinan 714000, China
  • Received:2013-02-26 Revised:2013-04-18 Online:2013-10-25 Published:2013-10-25
  • Contact: Chen Chang-Le E-mail:chenchl@nwpu.edu.cn
  • Supported by:
    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).

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摘要： An oxygen-deficient SrTiO3/La0.67Sr0.33MnO3 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 ∝ 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.

关键词: semiconductors, multilayer structure, electrical properties, magnetoresistance

Abstract: An oxygen-deficient SrTiO3/La0.67Sr0.33MnO3 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 ∝ 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.

Key words: semiconductors, multilayer structure, electrical properties, magnetoresistance

中图分类号:  (Other semiconductor-to-semiconductor contacts, p-n junctions, and heterojunctions)

  • 73.40.Lq
73.43.Qt (Magnetoresistance) 73.40.Ei (Rectification)