Nature of paramagnetic centers in polyaniline as studied by SQUID magnetometry
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The temperature and field dependences of the magnetic moment of polyaniline powder doped by m-cresol were measured by SQUID magnetometry in the temperature range 2–300 K at 1000 Oe and in the range 0–50000 Oe at 2 K, respectively. The field dependence is not described by the Brillouin function for spin 1/2, as is expected in the framework of a commonly accepted “metallic” model. Both dependences are quite correctly described by a “triplet” model using a distribution of singlet-triplet splitting (E) with the density distribution function having a narrow peak near E = 0.
Key wordspolyaniline magnetic moment SQUID magnetometry singlet-triplet splitting
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