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 Matzdorf¹ — ¹Universität 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.