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TT: Fachverband Tiefe Temperaturen
TT 7: SC: Properties, Electronic Structure, Mechanisms 2
TT 7.9: Talk
Monday, March 14, 2011, 16:00–16:15, HSZ 301
Dynamic response and anomalous plasmon dispersion of potassium doped picene — •Friedrich Roth1, Benjamin Mahns1, Mandy Grobosch1, 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 order to get a deeper insight into the electronic structure of the potassium intercalated picene and the peculiar physical properties of this recently discovered superconductor. A comparison of the loss function of the undoped and doped compound shows the appearance of a new peak in the optical gap, which we attributed to a charge carrier plasmon. We find a remarkable negative plasmon dispersion and a dramatic increase for the value of the background dielectric constant є∞ upon doping.