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TT: Fachverband Tiefe Temperaturen

TT 19: Poster Session: Correlated Electrons 1

TT 19.57: Poster

Montag, 20. März 2017, 15:00–19:00, P2-EG

Experimental determination of the Fermi surface in transition metal diborides — •Schorsch Michael Sauther¹, Matthias Dodenhöft¹, Matthias Brasse¹, Stephan Gerhard Albert¹, Jan Kuneš², Andreas Bauer¹, Alexander Regnat¹, Olga Young³, Uli Zeitler³, Christian Blum⁴, Sabine Wurmehl^4,5, Dirk Grundler⁶, Christian Pfleiderer¹, and Marc Andreas Wilde¹ — ¹Physik-Department, TU München — ²Institute of Physics, Academy of Sciences, Prag — ³HFML-EMFL, Radboud University, Nijmegen — ⁴IFW, Dresden — ⁵Institut für Festkörperphysik, TU Dresden — ⁶LMGN, IMX, STI, EPF Lausanne

Transition metal diborides exhibit a variety of ground states including BCS superconductivity and complex forms of magnetic order. For a detailed understanding of the magnetic and electronic properties a comprehensive picture of the Fermi surface (FS) is a prerequsite. For the itinerant antiferromagnet chromium diboride (CrB₂), e.g., the intricate interplay between FS properties and the complicated magnetic order is not yet fully understood [1]. We employ torque magnetometry at low temperatures down to 0.3 K and in high magnetic fields up to 35 T to measure the quantum oscillations of the magnetization, i.e., the de Haas-van Alphen (dHvA) effect. Combined with density functional theory (DFT) calculations, the dHvA effect is a powerful tool that allows determination of the FS properties. We present recent results on CrB₂ and further isostructural diborides.

[1] M. Brasse et al., Phys. Rev. B 88, 155138 (2013)