Electrical conduction in polyaniline-PMMA blends and their use as cryomagnetic temperature sensors

Electrical conduction in polymeric conductors is obscured by the presence o f strong disorder. Localization and Coulomb Interactions play a dominant ro le. The temperature dependence of the reduced activation energy, W = dln(si gma)/dln(T), shows that PAni-PMMA blends are on the metallic side of the me tal-insulator transition. The temperature and field dependences of conducti vity of PAni - PMMA blends are discussed. ESR line shape changes from a Dys onian with A/B ratio of about 2.5 to a Lorentzian, mirroring the temperatur e dependence of electrical conductivity and hence of the skin depth. Compar ison with the characteristics of commercial semiconductor thermometers show that these blends can be a viable alternative to them as cryomagnetic temp erature sensors.