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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. Ngankeu1,2, Emanuela Carleschi1, Bryan P. Doyle1, Volodymyr B. Zabolotnyy3, Timur K. Kim4, Ivana Vobornik5, Manju Unnikrishnan5, Rosalba Fittipaldi6, Mario Cuoco6, Antonio Vecchione6, and Sergey V. Borisenko31University 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.

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