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TT: Fachverband Tiefe Temperaturen

TT 42: Superconductivity: Fabrication, Properties, Electronic Structure

TT 42.6: Vortrag

Donnerstag, 29. März 2012, 16:15–16:30, H 3005

Electronic structure of doped hydrocarbon superconductors — •Friedrich Roth¹, Benjamin Mahns¹, Matteo Gatti², Pierluigi Cudazzo², Bernd Büchner¹, Angel Rubio², and Martin Knupfer¹ — ¹IFW Dresden, P.O. Box 270116, D-01171 Dresden, Germany — ²Nano-Bio Spectroscopy group and ETSF Scientific Development Centre, Dpto. Física de Materiales, Universidad del País Vasco, Av. Tolosa 72, E-20018 San Sebastián, Spain

We performed electron energy-loss spectroscopy studies in transmission in order to get a deeper insight into the electronic structure of the potassium intercalated recently discovered aromatic hydrocarbon superconductors, such as picene or coronene. A comparison of the loss function of the undoped and doped compound shows the appearance of a new peak in the case of picene and several new peaks in the case of coronene in the optical gap. For picene we find a remarkable negative plasmon dispersion and a dramatic increase for the value of the background dielectric constant upon doping.