Berlin 2012 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 45: Correlated Electrons: Poster Session

TT 45.74: Poster

Thursday, March 29, 2012, 15:00–19:00, Poster B

Surface Topology and Electronic Structure of Layered Strontium Ruthenates — •Robert Bienert¹, Melanie Klinke¹, Michael Waelsch¹, Sebastian Mietke¹, Jin Peng², Zhiqiang Mao², and René Matzdorf¹ — ¹Experimentalphysik II, Universität Kassel, Deutschland — ²Department of Physics, Tulane University, New Orleans, USA

In complex materials the interplay of properties like crystal structure, electronic structure and magnetism results in very interesting physical phenomena. The Ruddlesden-Popper series of layered Strontium Ruthenates Sr_n+1Ru_nO_3n+1 describes one class of these materials.

The double and triple layer systems behave like a Fermi liquid up to the transition temperature of 15 K and 24 K, respectively. In both compounds the local density of states (LDOS) shows a peak within the dip-like feature around the Fermi energy E_F. Using low-temperature (LT) STM and STS we studied the temperature dependence of the LDOS in the range from 4.7 to 35 K. By increasing the temperature the peak within the dip in the LDOS at E_F is only affected by thermal broadening.

The surface unit cell of the Strontium Ruthenates exhibits a c(2× 2) super structure, which is stable from 4.7 K up to room temperature as shown by our atomically resolved LT STM images and room temperature LEED experiments.