The effect of spin-orbit coupling on magnetoresistance in nonmagnetic organic semiconductors

We investigated the effect of spin-orbit coupling on magnetoresistance in nonmagnetic organic semiconductors.A Lorentz-type magnetoresistance is obtained from spin-orbit coupling-dependent spin precession under the condition of a space-charge-limited current.The magnetoresistance depends on the init...

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Bibliographic Details
Published inChinese physics B Vol. 21; no. 5; pp. 555 - 560
Main Author 赵俊卿 丁猛 张天佑 张宁玉 庞岩涛 季燕菊 陈莹 王凤翔 付刚
Format Journal Article
LanguageEnglish
Published 01.05.2012
Subjects
Consistency
Magnetic fields
Magnetoresistance
Magnetoresistivity
Organic semiconductors
Precession
Saturation
Simulation
Spin-orbit interactions
复合效应
无磁性
有机半导体材料
磁阻效应
空间电荷限制电流
耦合效应
自旋轨道耦合
自旋进动
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ISSN1674-1056
2058-3834
1741-4199
DOI10.1088/1674-1056/21/5/057110

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Summary:We investigated the effect of spin-orbit coupling on magnetoresistance in nonmagnetic organic semiconductors.A Lorentz-type magnetoresistance is obtained from spin-orbit coupling-dependent spin precession under the condition of a space-charge-limited current.The magnetoresistance depends on the initial spin orientation of the electron with respect to the hole in electron-hole pairs,and the increasing spin-orbit coupling slows down the change in magnetoresistance with magnetic field.The field dependence,the sign and the saturation value of the magnetoresistance are composite effects of recombination and dissociation rate constants of singlet and triplet electron-hole pairs.The simulated magnetoresistance shows good consistency with the experimental results.
Bibliography:Zhao Jun-Qing ,Ding Meng,Zhang Tian-You,Zhang Ning-Yu,Pang Yan-Tao,Ji Yan-Ju,Chen Ying,Wang Feng-Xiang,and Fu Gang School of Science,Shandong Jianzhu University,Jinan 250101,China
organic magnetoresistance; spin-orbit coupling; recombination; spin precession
11-5639/O4
We investigated the effect of spin-orbit coupling on magnetoresistance in nonmagnetic organic semiconductors.A Lorentz-type magnetoresistance is obtained from spin-orbit coupling-dependent spin precession under the condition of a space-charge-limited current.The magnetoresistance depends on the initial spin orientation of the electron with respect to the hole in electron-hole pairs,and the increasing spin-orbit coupling slows down the change in magnetoresistance with magnetic field.The field dependence,the sign and the saturation value of the magnetoresistance are composite effects of recombination and dissociation rate constants of singlet and triplet electron-hole pairs.The simulated magnetoresistance shows good consistency with the experimental results.
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ISSN:1674-1056
2058-3834
1741-4199
DOI:10.1088/1674-1056/21/5/057110