Document Type

Article

Peer Reviewed

1

Publication Date

7-28-2014

Journal/Book/Conference Title

Journal of Applied Physics

DOI of Published Version

10.1063/1.4891476

Abstract

We predict that singly occupied carrier traps, produced by electrical stress or irradiation within organic semiconductors, can cause spin blockades and the large room-temperature magnetoresistance known as organic magnetoresistance. The blockade occurs because many singly occupied traps can only become as doubly occupied in a spin-singlet configuration. Magnetic-field effects on spin mixing during transport dramatically modify the effects of this blockade and produce magnetoresistance. We calculate the quantitative effects of these traps on organic magnetoresistance from percolation theory and find a dramatic nonlinear dependence of the saturated magnetoresistance on trap density, leading to values ∼20 %, within the theory's range of validity.

Keywords

OAfund

Journal Article Version

Version of Record

Published Article/Book Citation

Journal of Applied Physics 116:4 (2014) pp. 043707-1-043707-4. doi:10.1063/1.4891476

Rights

Copyright: © 2014 AIP Publishing LLC

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URL

https://ir.uiowa.edu/physics_pubs/3