Metallic-like Wilson ratio in the polyaniline hydrochloride conducting polymer
- Laboratoire GREMAN, Université François Rabelais, UMR CNRS 7347, Parc de Grandmont, 37200 Tours (France)
- Laboratoire PCM2E, Université François Rabelais, EA 6299, Parc de Grandmont, 37200 Tours (France)
We report on the calorimetric and magnetic properties of the polyaniline hydrochloride in order to discuss its metallicity. Both the specific heat and the magnetic susceptibility χ have been investigated as a function of temperature from 300 K down to 2 K. The measurements of the specific heat have allowed us to determine the electronic Sommerfeld coefficient γ and the temperature dependence of the susceptibility has revealed a Pauli-like component. By combining χ and γ, the dimensionless Wilson ratio R{sub W}∝χ/γ demonstrates that the universal free electrons limit is reached above 100 K as a strong check of the metallicity of this conducting polymer. By removing the Pauli component from the measured susceptibility, the resulting contribution displays below 100 K a well-defined Curie-like component in agreement with a few percents of spins localized by disorder at low temperatures. These results are therefore consistent with an electronic itinerancy, namely, a metallic state even in the presence of disorder.
- OSTI ID:
- 22399336
- Journal Information:
- Journal of Applied Physics, Vol. 117, Issue 12; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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