Abstract
We report a study of the electron-spin dynamics in disordered conducting polymers by high-pressure electron-spin-resonance (ESR) measurements. Our model system is a polypyrrole doped with long chains of polyanion. Applying pressure the ESR linewidth increases with a rate of 50%/kbar, the spin susceptibility decreases by 30%/kbar, while the resistivity is decreased only by 3%/kbar. We can quantitatively account for the observed behavior in a model where the magnetic properties are dominated by thermally excited triplet bipolarons.
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