Following the recent discovery of large magnetoresistance at room temperature in polyfluorence sandwich devices, we have performed a comprehensive magnetoresistance study on a set of organic semiconductor sandwich devices made from different pi-conjugated polymers and small molecules. The measurements were performed at different temperatures, ranging from 10K to 300K, and at magnetic fields, B<100mT. We observed large negative or positive magnetoresistance (up to 10% at 300K and 10mT) depending on material and device operating conditions. We compare the results obtained in devices made from different materials with the goal of providing a comprehensive picture of the experimental data. We discuss our results in the framework of known magnetoresistance mechanisms and find that none of the existing models can explain our results.
@article{arxiv.cond-mat/0504738,
title = {Large magnetoresistance in $\pi$-conjugated semiconductor thin film devices},
author = {Ö. Mermer and G. Veeraraghavan and T. L. Francis and Y. Sheng and D. T. Nguyen and M. Wohlgenannt and A. Köhler and M. K. Al-Suti and M. S. Khan},
journal= {arXiv preprint arXiv:cond-mat/0504738},
year = {2016}
}