Couto, Jullianna DénesSantos, Mirela de CastroBianchi, Rodrigo Fernando2019-06-102019-06-102019COUTO, J. D.; SANTOS, M. de C.; BIANCHI, R. F. Exploring the universality of the alternating conductivity of disordered materials using the Gaussian distribution of activation energies. Materials Research Express, v. 6, n. 4, p. 1-8, 2019. Disponível em: <https://iopscience.iop.org/article/10.1088/2053-1591/aad1ce>. Acesso em: 19 mar. 2019.2053-1591http://www.repositorio.ufop.br/handle/123456789/11508This paper presents a newapproach for the analysis of ACconductivity, s*(w)= s¢(w)+is(w), in disordered solids which brings together the quasi-universal frequency-dependent conductivity and the idea of a Gaussian distributions of probable activation energy barriers for hopping carriers. An explicit expression forAC conductivity was obtained using a complex dielectric response function and a continuous time random walk treatment applied to a lattice obeying the Kubo’s fluctuationdissipation theorem. This expression provides an insight into the universality of the form s¢(w) μ ws (0  s  1) and s(w) μ kw (k is the dielectric constant), aswell into the effect of the Gaussian disorder on exponent s.We discuss the similarities and differences with the Random Free Energy Barrier model equivalent to the long-used box model, and it brings support to an extending expression proposed by JCDyre and one of the authors. The applicability of the model to experimental observations on poly[(2-methoxy-5-hexyloxy)-p-phenylenevinylene] reveals the dielectric constant, mean energy and variance of the Gaussian distribution for hopping carriers in this disordered conjugated polymer.pt-BRrestritoHopping transportOrganic semiconductorsConductivity phenomena in semiconductorArtigo publicado em periodicohttps://iopscience.iop.org/article/10.1088/2053-1591/aad1ce/metahttps://doi.org/10.1088/2053-1591/aad1ce