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TT: Fachverband Tiefe Temperaturen

TT 20: Correlated Electrons - Poster Session

TT 20.48: Poster

Mittwoch, 28. März 2007, 14:00–17:45, Poster A

Electronic Raman scattering and phonon anomalies in Na_xCoO₂. — Vladimir Gnezdilov¹, Patric Scheib², •Peter Lemmens², Fangcheng Chou⁴, Lambert Alff⁵, Yoshiharu Krockenberger³, Hanns-Ulrich Habermeier³, Chengtian Lin³, and Bernhard Keimer³ — ¹Institute 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 Na_xCoO₂ · 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.