Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 28: Correlated Electrons: Quantum-Critical Phenomena - Experiment

TT 28.6: Vortrag

Dienstag, 8. März 2016, 11:15–11:30, H21

Fermi surface of NiS₂ — •Pascal Reiss¹, Hui Chang¹, Jordan Baglo¹, Sven Friedemann², and F Malte Grosche¹ — ¹Cavendish Laboratory, University of Cambridge, United Kingdom — ²HH Wills Physics Laboratory, University of Bristol, United Kingdom

Upon application of hydrostatic pressure of roughly 30 kbar, NiS₂ is found to display a transition from a Mott insulating state with a weak ferromagnetic ordering into a metallic state with an antiferromagnetic ordering. In this talk, we will present the results of band structure calculations based on DFT which aim to describe the high-pressure state. In particular, we will study the size and the topology of the Fermi surface in dependence of both the magnetic ordering and the intra-site Coulomb repulsion U. The predicted extremal orbits and band masses are compared with recently performed quantum oscillation measurements. This enables us to better understand the nature of the Mott insulator transition in NiS₂.