Abstract
Overhauser shift ( ΔB ov ) of the electron spin resonance (ESR) line due to dynamic nuclear spin polarization (DNP) of the hyperfine coupled nuclei is observed for the fully doped, conducting form of polythiophene (PT) at 1.9 K. The DNP enhancement factor V ≈ 55 is determined via dependence of the ΔB ov on the microwave power. The proton spin relaxation time HT 1 is determined from the relaxation of the ΔB ov after switching the rf pulse. The average hyperfine coupling constant A zz is calculated to be ≈−5.6 MHz. The results will be discussed in terms of origin of the ESR signal in the fully doped polythiophene and localized moments in interaction with conduction electron sea.
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