Temperature dependence of a zero bias anomaly in scanning tunnelling spectra of Sr(4)Ru(3)O(10)*

We have studied a zero bias anomaly in scanning tunnelling spectra of layered ruthenate Sr(4)Ru(3)O(10). This material shows a dip-like feature in the dI/dV spectra, which has previously observed in the single-layer Sr(2)RuO(4) and double- layer Sr(3)Ru(2)O(7) 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.