Transformation of polarons to bipolarons in disordered matter

Details Transformation of polarons to bipolarons in disordered matter Transformation of polarons to bipolarons in disordered matter

2008-05-16

arxiv.org/abs/0805.2488v2

Physics

Condensed Matter

Disordered Systems and Neural Networks

8 pages plus 3 figures. Accepted for publication in Applied Physics Letters

Scientific paper

10.1063/1.2938995

The polaron to bipolaron transition in disordered media under the influence of a broadband ac electric field is suggested: ac conductivity vs. frequency measurements in disordered media with inhomogeneous disorder induce spatio-temporal fluctuations of the density of polarons yielding polaron to bipolaron transformation. The external field results in the transition, alternatively to an increasing doping level. The assertion is confirmed by performing successive complex impedance measurements in disordered media. A systematic increase of the real part of the ac conductivity in the frequency domain, followed by mutual reduction of the magnetic inductivity of conducting polypyrrole, are explained.

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