Regensburg 2013 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 53: Correlated Electrons: Heavy Fermions

TT 53.7: Vortrag

Donnerstag, 14. März 2013, 11:00–11:15, H19

Electronic Structure of LuRh₂Si₂ - reference to YbRh₂Si₂ — •Pascal Reiss¹, Swee K. Goh¹, F. Malte Grosche¹, Zachary Fisk², Michael Sutherland¹, Patrick M.C. Rourke³, Gertrud Zwicknagl⁴, and Sven Friedemann¹ — ¹Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, CB3 0HE Cambridge, United Kingdom — ²Department of Physics and Astronomy, University of California, Irvine, CA 92697-4575, USA — ³National Research Council Canada, 1200 Montreal Road, Ottawa, Ontario, K1A 0R6, Canada — ⁴Institute for Mathematical Physics, TU Braunschweig, Mendelssohnstraße 3, 38106 Braunschweig, Germany

The intermetallic compound LuRh₂Si₂ is of interest as a non-magnetic reference compound to the heavy fermion material YbRh₂Si₂. YbRh₂Si₂ features an intensively studied quantum critical point (QCP) when small magnetic fields suppress the Neel temperature to zero. Signatures in transport and thermodynamic properties suggest a reconstruction of the Fermi Surface from a small configuration with localised f-electrons in the antiferromagnetic phase to a large configuration with itinerant f-electrons in the paramagnetic phase. Hence isostructural LuRh₂Si₂ with its completely filled f-shell and identical lattice parameters is a perfect reference compound for the small Fermi surface configuration. Here we present band structure calculations of LuRh₂Si₂ and compare predicted and observed Shubnikov-de Haas frequencies under different angles in dependence of the relative z/c position of the Si atoms.