Electrical Conductivity of Indium–poly(diphenylene Phthalide)–indium Layered Structures at Low Temperatures

Poly(diphenylene phthalide) (PDP) is an organic polymer that is a dielectric in the ground state, but exhibits electrical conductivity in a metastable state, which can be stimulated by external disturbance. In this work, the transport properties of thin-film indium – PDP – indium “sandwiches” were experimentally studied over a wide temperature range. At temperatures below ~3.4 K, features are observed that can be explained by the effect of induced superconductivity in a thin film of conducting polymer sandwiched between two massive superconductors (indium).