Regensburg 2010 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 24: SC: Properties, Electronic Structure, Mechanisms

TT 24.11: Talk

Wednesday, March 24, 2010, 17:15–17:30, H19

Plasmons and interband transitions of Sr_14−xCa_xCu₂₄O₄₁ investigated by electron energy-loss spectroscopy — •Friedrich Roth, Martin Knupfer, Christian Hess, and Bernd Büchner — IFW Dresden, P.O. Box 270116, D-01171 Dresden, Germany

Electron energy-loss spectroscopy has been used to investigate the loss-function between 0 and 70 eV of singel-crystalline Sr_14−xCa_xCu₂₄O₄₁, composed of two-leg Cu₂O₃ ladders and edge-sharing CuO₂ chains, with various compositions. We found significant exitations in the low-energy range which are different for momentum transfer q parallel to the a- and c-axes. Comparison with reflectivity data from literature [1] shows a good agreement with our data. Also the disperions of a charge-carrier plasmon like in Bi₂Sr₂CaCu₂O₈ [2] was obeserved for Sr₃Ca₁₁Cu₂₄O₄₁.

[1] Osafune, T. et al., Phys. Rev. Lett. 78 1980 (1997) [2] Nücker, N. et al., Phys. Rev. B 39 12379 (1989)