Abstract
Electrical conduction in polymeric conductors is obscured by the presence of strong disorder. Localization and Coulomb Interactions play a dominant role. The temperature dependence of the reduced activation energy, W = dln(σ)/dln(T), shows that PAni-PMMA blends are on the metallic side of the metal-insulator transition. The temperature and field dependences of conductivity of PAni - PMMA blends are discussed. ESR line shape changes from a Dysonian with A/B ratio of about 2.5 to a Lorentzian, mirroring the temperature dependence of electrical conductivity and hence of the skin depth. Comparison with the characteristics of commercial semiconductor thermometers show that these blends can be a viable alternative to them as cryomagnetic temperature sensors.
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