Dresden 2006 – scientific programme

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TT: Tiefe Temperaturen

TT 7: Superconductivity & Solids At Low Temperature - Poster Session

TT 7.34: Poster

Monday, March 27, 2006, 14:00–17:45, P1

Spectroscopic investigations on Na_xCoO₂ — •T. Kroll¹, A.A. Aligia ², J. Geck¹, D. Hawthorn ³, C. Hess¹, T. Schwieger¹, G. Krabbes¹, C. Sekar¹, D. Batchlor⁴, M. Knupfer¹, J. Berger⁵, J. Fink¹, G.A. Sawatzky³, and B. Büchner¹ — ¹IFW Dresden, P.O. Box 270016, D-01171 Dresden, Germany — ²Centro Atomico Bariloche (CAB), Av. Bustillo 9500, 8400 S.C. de Bariloche, Argentina — ³Advanced Materials and Process Engineering Laboratory (AMPEL), 2355 East Mall, Vancouver, BC, V6T 1Z4, Canada — ⁴Universität Würzburg, Am Hubland, D-97074 Würzburg — ⁵Institute of Physics of Complex Matter, EPFL, CH-1015 Lausanne, Switzerland

Since the discovery of superconductivity in 2003 in Na_0.3CoO₂1.3H₂O many investigations have been performed on these materials. In order to understand the physics behind the rich phase diagram of Na_xCoO₂ in more detail a good knowledge of its electronic structure is crucial. In this poster we present the results of different spectroscopic methods such as NEXAFS and XPS on a wide doping range for different temperatures and polarisation as well as cluster calculations which helps to understand the electronic structure of Na_xCoO₂.