Abstract
We investigate the magnetic field effects in thin-film diodes made of the conducting polymer poly(styrene-sulfonate)-doped poly(3,4-ethylenedioxythiophene) as a function of temperature and electrical current. Magnetoresistance of these devices can be measured to high precision on two distinct magnetic field scales: <3 mT, where a pronounced nonmonotonic magnetoresistance response can be resolved, owing to weak hyperfine coupling, and at intermediate magnetic fields, ranging between 3 and 10 mT, where strong monotonic magnetoresistance is seen. The detailed examination of the magnetoresistance effects in both regimes allows one to scrutinize the accuracy of the underlying models for the behavior of these kinds of materials.
Highlights
We have recently shown that the study of specific magnetic field effects, such as the ultrasmall magnetic field effect (
When ΔBðIÞ is plotted as a function of BmðIÞ as shown in Fig. 3(d), a linear relationship is found in the driving-current-dependent data, as in the temperature-dependent measurements. Both intermediate and ultrasmall magnetic field effects appear to be heavily affected by a change in driving current, which may indicate a strong dependence on the carrier density within the PEDOT:PSS thin-film diode
The experimental data presented above reflects the most comprehensive study of PEDOT:PSS magnetoresistance. It is consistent with previously reported behavior of magnetoresistance of PEDOT:PSS thin-film diodes,[14,23] and it reveals the full complexity of the PEDOT:PSS magnetoresistance due to its nontrivial dependence on the device operating point
Summary
Spin-pair correlations within organic compounds continue to intrigue researchers at the intersection of biology, chemistry, and physics.[1,2,3,4,5,6] One approach to study spin-pair correlations is the use of magnetic fields of different strengths and the subsequent observation of changes of macroscopic properties of the objects of interest.[7,8,9,10,11,12] when investigating conducting polymers in a solid thin-film form, the examined materials are often incorporated in heterostructure devices consisting of multiple layers and mixtures of materials.[1,2,4,9,12,13] We have recently shown that the study of specific magnetic field effects, such as the ultrasmall magnetic field effect (
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