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TT: Fachverband Tiefe Temperaturen
TT 41: Correlated Electrons: Quantum-Critical Phenomena
TT 41.8: Vortrag
Mittwoch, 22. März 2017, 11:30–11:45, HSZ 204
Quantum oscillations in the pressure-metallised Mott insulator NiS2 — •Konstantin Semeniuk1, Hui Chang1, Sven Friedemann2, Jordan Baglo1, Monika Gamza3, Pascal Reiss4, Alix McCollam5, Inge Leermakers5, Patricia Alireza1, Audrey Grockowiak6, William Coniglio6, Stanley Tozer6, and Malte Grosche1 — 1Cavendish Laboratory, University of Cambridge, UK — 2HH Wills Laboratory, University of Bristol, UK — 3Jeremiah Horrocks Institute, University of Central Lancashire, UK — 4Clarendon Laboratory, University of Oxford, UK — 5High Field Magnet Laboratory, Nijmegen, The Netherlands — 6NHMFL, Tallahassee, Florida, USA
The metallic state on the threshold of Mott localisation represents one of the most fundamental examples of correlated electron physics. The 3D Mott insulator NiS2 can be tuned into the metallic state by moderate hydrostatic pressure of about 30 kbar, enabling quantum oscillation measurements in close proximity to the Mott transition.
We present the results of a comprehensive Fermi surface study of NiS2 performed in magnetic fields of up to 35 T, using a tunnel diode oscillator technique with 0.01ppm frequency resolution in combination with liquid medium high pressure anvil cells. The evolution of the Fermi surface and the effective carrier masses of NiS2 has been tracked from 33 to 55 kbar, and a rotation study has been carried out to resolve the 3D geometry of the principal Fermi surface sheet. Our results are interpreted in the context of the canonical Brinkman-Rice picture of Mott localisation.