Electronic structure of undoped and potassium doped coronene investigated by electron energy-loss spectroscopy

摘要

We performed electron energy-loss spectroscopy studies in transmission inorder to obtain insight into the electronic properties of potassiumintercalated coronene, a recently discovered superconductor with a rather hightransition temperature of about 15\,K. A comparison of the loss function ofundoped and potassium intercalated coronene shows the appearance of several newpeaks in the optical gap upon potassium addition. Furthermore, our core levelexcitation data clearly signal filling of the conduction bands with electrons.