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Berlin 2008 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 18: Correlated Electrons: Low-dimensional Systems - Materials 2

TT 18.11: Talk

Tuesday, February 26, 2008, 18:00–18:15, H 2053

Temperature dependence of a zero bias anomaly in scanning tunnelling spectra of Sr4Ru3O10 — •Bernhard Nansseu1, Tatjana Novgorodov1, Michael Waelsch1, Jürgen Hager1, Jiandi Zhang2, R. Moore3, Ward Plummer3, Zhiqiang Mao4, and Rene Matzdorf11Universität Kassel, Kassel, Germany — 2Florida International University, Miami, USA — 3Oak Ridge National Laboratory and University of Tennessee, USA — 4Tulane University, New Orleans, USA

We have studied a zero bias anomaly in scanning tunnelling spectra of the layered ruthenate Sr4Ru3O10. This material shows a dip-like feature in the dI/dV spectra, which has previously observed in the single-layer Sr2RuO4 and double-layer Sr3Ru2O7 ruthenates. We have studied in particular the temperature dependence of the zero bias anomaly, which is in all three materials different. The triple-layer material shows intergrowth of single and double layers, which have been identified by their spectroscopic fingerprint. Finally, we discuss different effects as possible explanations for the zero bias anomaly.

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