Large magnetoresistance in $π$-conjugated semiconductor thin film devices

Details Large magnetoresistance in $π$-conjugated semiconductor thin film devices Large magnetoresistance in $π$-conjugated semiconductor thin film devices

2005-04-27

arxiv.org/abs/cond-mat/0504738v1

Physics

Condensed Matter

Materials Science

Scientific paper

10.1103/PhysRevB.72.205202

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.

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