Berlin 2015 – scientific programme

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O: Fachverband Oberflächenphysik

O 66: Electronic Structure of Surfaces

O 66.10: Poster

Wednesday, March 18, 2015, 18:15–21:00, Poster A

Analysis of the Band Dispersions of the Bilayer Ruthenate Sr₃Ru₂O₇ around the High Symmetry Points — •Arlette S. Ngankeu^1,2, Emanuela Carleschi¹, Bryan P. Doyle¹, Volodymyr B. Zabolotnyy³, Timur K. Kim⁴, Ivana Vobornik⁵, Manju Unnikrishnan⁵, Rosalba Fittipaldi⁶, Mario Cuoco⁶, Antonio Vecchione⁶, and Sergey V. Borisenko³ — ¹University of Johannesburg (South Africa) — ²Aarhus University (Denmark) — ³IFW Dresden (Germany) — ⁴Diamond Light Source ( United Kingdom) — ⁵IOM-CNR TASC Laboratory Trieste (Italy) — ⁶CNR-SPIN and Department of Physics, University of Salerno (Italy)

We have investigated the formation of heavy d electron quasiparticles in Sr₃Ru₂O₇ by analysing the dispersion of the low-energy states around the high symmetry points Γ and X of the first Brillouin zone. This study was performed at the BESSY 1³ ARPES endstation. We report the existence of flat bands giving rise to van Hove singularities (vHS) in the DOS in closed proximity to the Fermi level, associated to the γ₂, α₂ and δ Fermi surface sheets. These vHS are deemed to be responsible for the appearance of the multiple metamagnetism observed in the system. Our results also show signatures of strong correlation effects characterised by the peak-dip-hump line shape of the dispersive states. Finally, we have noted the presence of bands not predicted by electronic structure calculations, which might be band replicas ascribed to the reconstruction of the sample surface.