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


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. © 2013 IOP Publishing Ltd.
Author V. T. Santana - [UNESP-Universidade Estadual Paulista]
V. T. Santana,,
, O. R. Nascimento - [Universidade de Sao Paulo - USP]
O. R. Nascimento,,
, D. Djurado - [CEA Grenoble]
D. Djurado,,
, J. P. Travers - [CEA Grenoble]
J. P. Travers,,
, Adam Proń (FC / CPCT)
Adam Proń,,
- Chair Of Polymer Chemistry And Technology
, L. Walmsley - [UNESP-Universidade Estadual Paulista]
L. Walmsley,,
Journal seriesJournal of Physics-Condensed Matter, ISSN 0953-8984
Issue year2013
Keywords in EnglishA 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
ASJC Classification3104 Condensed Matter Physics; 2500 General Materials Science
URL http://iopscience.iop.org/article/10.1088/0953-8984/25/11/116004/meta;jsessionid=515957891EB0E466F339637E5EA9564F.c2.iopscience.cld.iop.org
Languageen angielski
journalofphyscicscondensedmatter_2013_25_116004.pdf 576.18 KB
Score (nominal)30
Score sourcejournalList
ScoreMinisterial score = 30.0, 25-07-2020, ArticleFromJournal
Ministerial score (2013-2016) = 30.0, 25-07-2020, ArticleFromJournal
Publication indicators WoS Citations = 2; Scopus Citations = 2; GS Citations = 2.0; Scopus SNIP (Source Normalised Impact per Paper): 2013 = 1.035; WoS Impact Factor: 2013 = 2.223 (2) - 2013=2.335 (5)
Citation count*2 (2015-05-17)
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