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Berlin 2015 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 18: PhD symposium of the Division of Magnetism and the jDPG 2015: Quantum Phase Transitions: Emergent phenomena beyond elementary excitations

MA 18.13: Poster

Dienstag, 17. März 2015, 16:15–16:30, EB 301

Fermi surface on the border of Mott transition in NiS2 — •Hui Chang1, Sven Friedemann1,2, Monika Gamza3, William Coniglio4, David Graf4, Stan Tozer4, and Malte Grosche11Cavendish Laboratory, University of Cambridge, UK — 2HH Wills Laboratory, University of Bristol, UK — 3Department of Physics, Royal Holloway, University of London, Egham, UK — 4National High Magnetic Field Laboratory, Tallahassee, Florida 32310, USA

The transition from a metallic to a correlated, or Mott, insulating state is a long-standing theme of fundamental interest in condensed matter research. Using quantum oscillation measurements in high magnetic fields to probe the electronic Fermi surface and effective carrier mass on the metallic side of the transition could provide much needed microscopic information. In the cuprates, such studies in samples doped into the metallic state have identified the Fermi surface structure in underdoped and overdoped regimes. Because the quantum oscillation signal is strongly suppressed in the presence of disorder, pressure rather than doping should ideally be used to reach the metallic state. We present the first observation of quantum oscillations from a pressure-metallised 3D Mott insulator. NiS2 can be tuned through the Mott transition at a modest pressure of 30kbar. Quantum oscillations near the Mott transition are observed with the tunnel diode oscillator technique in magnetic fields up to 31T. The main observed oscillation frequency is consistent with the Fermi surface obtained within density functional theory, whereas the effective mass is significantly enhanced over the band mass.

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