Magnetic studies of FeCl 4 − -doped poly(3-alkylthiophenes) and poly(4,4’-dialkyl-2,2’-bithiophenes)
1993; American Physical Society; Volume: 48; Issue: 1 Linguagem: Inglês
10.1103/physrevb.48.243
ISSN1095-3795
AutoresP. Barta, S. Nizioł, Małgorzata Zagórska, Adam Proń, Z. Trybul a,
Tópico(s)Organic and Molecular Conductors Research
ResumoTwo types of soluble conducting polymers doped with ${\mathrm{FeCl}}_{4}^{\mathrm{\ensuremath{-}}}$ were investigated, namely, poly(3-alkylthiophenes) and their ``head-to-head,'' ``tail-to-tail'' coupled analogues: poly(4,4'-dialkyl-2,2'-bithiophenes). The samples were subjected to static magnetic measurements of the magnetic susceptibility (the Faraday balance) and electron-spin-resonance spectroscopy in a wide temperature range (4.2--273 K). A classical paramagnetic dependence of the static magnetic susceptibility can be found at high temperatures. On the other hand, a different magnetic effect appears at low temperatures. This may suggest that below a certain temperature (denoted as ${\mathit{T}}_{\mathit{a}}$), short-range magnetic order affects the magnetic response of the polymer samples.
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