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Regensburg 2007 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 20: Correlated Electrons - Poster Session

TT 20.48: Poster

Wednesday, March 28, 2007, 14:00–17:45, Poster A

Electronic Raman scattering and phonon anomalies in NaxCoO2.Vladimir Gnezdilov1, Patric Scheib2, •Peter Lemmens2, Fangcheng Chou4, Lambert Alff5, Yoshiharu Krockenberger3, Hanns-Ulrich Habermeier3, Chengtian Lin3, and Bernhard Keimer31Institute for Low Temperature Physics and Engineering, NASU, Kharkov, Ukraine — 2Institut für Physik der kondensierten Materie, TU Braunschweig, Braunschweig — 3Max-Planck-Institute for Solid State Research, Stuttgart — 4Center for Materials Science and Engineering, MIT, Cambridge, USA — 5Institute of Material Science, TU Darmstadt, Darmstadt

Raman scattering in nonsuperconducting and superconducting cobaltates NaxCoO2 · y H2O shows pronounced anomalies in the phonon as well as the electronic contribution to the scattering cross section. The effect of doping and hydration on these anomalies is studied and used for a characterization of single crystals and thin films. Work supported by DFG, ESF-HFM and MRSEC Program of NSF under award number DMR 02-13282.

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