A two-site bipolaron model for organic magnetoresistance

被引：51

作者：

Wagemans, W.

Bloom, F. L.

Bobbert, P. A.

Wohlgenannt, M. ^{[1
,2
]}

Koopmans, B.

机构：

[1] Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA

[2] Univ Iowa, Opt Sci & Technol Ctr, Iowa City, IA 52242 USA

来源：

JOURNAL OF APPLIED PHYSICS | 2008年 / 103卷 / 07期

关键词：

D O I：

10.1063/1.2828706

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The recently proposed bipolaron model for large "organic magnetoresistance" (OMAR) at room temperature is extended to an analytically solvable two-site scheme. It is shown that even this extremely simplified approach reproduces some of the key features of OMAR, viz., the possibility to have both positive and negative magnetoresistance, as well as its universal line shapes. Specific behavior and limiting cases are discussed. Extensions of the model, to guide future experiments and numerical Monte Carlo studies, are suggested. (C) 2008 American Institute of Physics.

引用

收藏

页数：3

相关论文

共 7 条

[1] Separating positive and negative magnetoresistance in organic semiconductor devices [J].

Bloom, F. L. ;

Wagemans, W. ;

Kemerink, M. ;

Koopmans, B. .

PHYSICAL REVIEW LETTERS, 2007, 99 (25)

[2] Bipolaron mechanism for organic magnetoresistance [J].

Bobbert, P. A. ;

Nguyen, T. D. ;

van Oost, F. W. A. ;

Koopmans, B. ;

Wohlgenannt, M. .

PHYSICAL REVIEW LETTERS, 2007, 99 (21)

[3] Magnetoresistance and efficiency measurements of Alq3-based OLEDs [J].

Desai, Pratik ;

Shakya, P. ;

Kreouzis, T. ;

Gillin, W. P. ;

Morley, N. A. ;

Gibbs, M. R. J. .

PHYSICAL REVIEW B, 2007, 75 (09)

[4] Large magnetoresistance at room temperature in semiconducting polymer sandwich devices -: art. no. 185 [J].

Francis, TL ;

Mermer, Ö ;

Veeraraghavan, G ;

Wohlgenannt, M .

NEW JOURNAL OF PHYSICS, 2004, 6 :1-8

[5] Large magnetoresistance in nonmagnetic π-conjugated semiconductor thin film devices -: art. no. 205202 [J].

Mermer, O ;

Veeraraghavan, G ;

Francis, TL ;

Sheng, Y ;

Nguyen, DT ;

Wohlgenannt, M ;

Köhler, A ;

Al-Suti, MK ;

Khan, MS .

PHYSICAL REVIEW B, 2005, 72 (20)

[6] Anomalous room temperature magnetoresistance in organic semiconductors [J].

Prigodin, V. N. ;

Bergeson, J. D. ;

Lincoln, D. M. ;

Epstein, A. J. .

SYNTHETIC METALS, 2006, 156 (9-10) :757-761

[7] Tuning magnetoresistance and magnetic-field-dependent electroluminescence through mixing a strong-spin-orbital-coupling molecule and a weak-spin-orbital-coupling polymer [J].

Wu, Yue ;

Xu, Zhihua ;

Hu, Bin ;

Howe, Jane .

PHYSICAL REVIEW B, 2007, 75 (03)