Evidence of weak ferromagnetism in doped plasticized polyaniline (PANI-DDoESSA) 0.5 from electron spin resonance measurements
V. T. Santana , O. R. Nascimento , D. Djurado , J. P. Travers , Adam Proń , L. Walmsley
AbstractX-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. © 2013 IOP Publishing Ltd.
|Journal series||Journal of Physics-Condensed Matter, ISSN 0953-8984|
|Keywords in English||A transitions; Chain direction; Crystalline regions; Dzyaloshinskii-moriya; Electron spin resonance measurements; Exchange constants; Freestanding films; Localized state; Protonated; Rough estimation; Spin 1/2; Weak ferromagnetism; X-band electron spin resonances|
|Score|| = 30.0, 25-07-2020, ArticleFromJournal|
= 30.0, 25-07-2020, ArticleFromJournal
|Publication indicators||= 2; = 2; = 2.0; : 2013 = 1.035; : 2013 = 2.223 (2) - 2013=2.335 (5)|
|Citation count*||2 (2015-05-17)|
* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.