We demonstrate that the nuclear spin fluctuations lead to electric current noise in mesoscopic samples of organic semiconductors, which show pronounced magnetoresistance weak magnetic fields. For bipolaron and electron-hole mechanisms magnetoresistance, spectrum consists high-frequency peak related precession Knight field charge carriers low-frequency relaxation. The shape depends on external r...

The possibility of formation of a new type of polaron based on the quantum aniferromagnet (AF) model is reported. We take into account exchange interactions between localized d-d spins of the AF, as well as the p-d interaction of the AF with p-carriers. The energy minimum is found when maximum charge density occurs on every second spin. The formation of such “comb”-like polarons results from th...