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Dresden 2017 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 60: Correlated Electrons: f-Electron Systems

TT 60.9: Vortrag

Donnerstag, 23. März 2017, 11:45–12:00, HSZ 201

Field induced Lifshitz transition in UPt2Si2: Fermi surface under extreme conditionsDirk Schulze Grachtrup1, •Nico Steinki1, Stefan Süllow1, Zübeyir Cakir2, Gertrud Zwicknagl2, Yuriy Krupko3, Marcelo Jaime4, and John A. Mydosh51Institut für Physik der Kondensierten Materie, TU Braunschweig, D-38106 Braunschweig, Germany — 2Institut für Mathematische Physik, TU Braunschweig, D-38106 Braunschweig, Germany — 3Laboratoire National des Champs Magnétiques Intenses (LNCMI-EMFL), CNRS, UGA, 38042 Grenoble, France — 4National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA — 5Kamerlingh Onnes Laboratory, Leiden University, 2300RA Leiden, The Netherlands

We have measured Hall effect, magnetotransport and magnetostriction on the field induced phases of single crystalline UPt2Si2 in magnetic fields up to 60 T at temperatures down to 50 mK. For the magnetic field applied along the c axis we observe strong changes in the Hall effect at the phase boundaries. From a comparison to band structure calculations utilizing the concept of a dual nature of the uranium 5f electrons, we find evidence for field induced topological changes of the Fermi surface due to at least one Lifshitz transition. Furthermore, we find a unique history dependence of the magnetotransport and magnetostriction data, indicating that the Lifshitz type transition is of a discontinuous nature, as predicted for interacting electron systems.

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