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

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

Transport and magnetoresistance effect in an oxygen-deficient SrTiO ₃/La_0.67Sr_0.33MnO₃ heterojunction

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

School of Materials Sience and Engineering

Research output: Contribution to journal › Article › peer-review

Abstract

An oxygen-deficient SrTiO₃/La_0.67Sr _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 ∝ 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.

Original language	English
Article number	127302
Journal	Chinese Physics B
Volume	22
Issue number	12
DOIs	https://doi.org/10.1088/1674-1056/22/12/127302
State	Published - Dec 2013

Keywords

electrical properties
magnetoresistance
multilayer structure
semiconductors

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10.1088/1674-1056/22/12/127302

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

abstract = "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.",

keywords = "electrical properties, magnetoresistance, multilayer structure, semiconductors",

author = "Jing Wang and Chen, {Chang Le} and Yang, {Shi Hai} and Luo, {Bing Cheng} and Duan, {Meng Meng} and Jin, {Ke Xin}",

year = "2013",

month = dec,

doi = "10.1088/1674-1056/22/12/127302",

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volume = "22",

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TY - JOUR

T1 - Transport and magnetoresistance effect in an oxygen-deficient SrTiO 3/La0.67Sr0.33MnO3 heterojunction

AU - Wang, Jing

AU - Chen, Chang Le

AU - Yang, Shi Hai

AU - Luo, Bing Cheng

AU - Duan, Meng Meng

AU - Jin, Ke Xin

PY - 2013/12

Y1 - 2013/12

N2 - 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.

AB - 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.

KW - electrical properties

KW - magnetoresistance

KW - multilayer structure

KW - semiconductors

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U2 - 10.1088/1674-1056/22/12/127302

DO - 10.1088/1674-1056/22/12/127302

M3 - 文章

AN - SCOPUS:84891499242

SN - 1674-1056

VL - 22

JO - Chinese Physics B

JF - Chinese Physics B

IS - 12

M1 - 127302

ER -

Transport and magnetoresistance effect in an oxygen-deficient SrTiO ₃/La_0.67Sr_0.33MnO₃ heterojunction

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