Evidence of weak ferromagnetism in doped plasticized polyaniline (PANI-DDoESSA) sub(0.5) from electron spin resonance measurements
X-band electron spin resonance (ESR) measurements have been performed on a conducting free-standing film of polyaniline plasticized and protonated with di-n-dodecyl ester of sulfosuccinic acid (DDoESSA). The magnetic field was applied parallel and perpendicular to the plane of the film. At around 75...
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Veröffentlicht in: | Journal of physics. Condensed matter 2013-03, Vol.25 (11), p.1-6 |
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Sprache: | eng |
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Zusammenfassung: | X-band electron spin resonance (ESR) measurements have been performed on a conducting free-standing film of polyaniline plasticized and protonated with di-n-dodecyl ester of sulfosuccinic acid (DDoESSA). The magnetic field was applied parallel and perpendicular to the plane of the film. At around 75 K a transition is observed from Pauli susceptibility to a localized state in which the spin 1/2 polarons behave as spin 1/2 dimers. A rough estimation of the intradimer and interdimer exchange constants is obtained. Below 5 K, ESR data reveal a weak ferromagnetism with the Dzyaloshinskii-Moriya vector mainly oriented in the plane of the film. The existence of a relatively well-defined n-fold axis along the chain direction in the crystalline regions confers a symmetry compatible with such analysis. |
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ISSN: | 0953-8984 1361-648X |
DOI: | 10.1088/0953-8984/25/11/116004 |