DPG Phi
Verhandlungen
Verhandlungen
DPG

SKM 2023 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

TT: Fachverband Tiefe Temperaturen

TT 9: f-Electron Systems and Heavy Fermions II

TT 9.1: Vortrag

Montag, 27. März 2023, 15:00–15:15, HSZ 201

Quantum oscillations in heavy-fermion ferromagnet YbNi4P2 over many Zeeman induced Lifshitz transitions — •William Broad1, Sven Friedemann1, Owen Moulding1, Takaki Muramatsu1, Kristin Kliemt2, and Cornelius Krellner21University of Bristol, Bristol, United Kingdom — 2Goethe-Universität, Frankfurt am Main, Germany

YbNi4P2 is a heavy-fermion metal situated near a very rare ferromagnetic quantum critical point (FM QCP). Understanding the nature of this ferromagnetism requires knowledge of the Fermi surface; it has been speculated that this FM QCP is enabled by a quasi-1D Fermi surface. At the same time, the strongly renormalised band structure is readily modified by relatively small magnetic fields, with nine Lifshitz transitions below 20 T due to Zeeman splitting. Here, we present Shubnikov–de Haas oscillations up to 35T, including detailed rotation and mass studies. We present analysis over several of these Lifshitz transitions, observing frequency changes and appearances/disappearances. We model the band structure with DFT calculations of the local 4f reference compound LuNi4P2 and use rigid-band shifts to approximate the effect of the Kondo hybridisation. At highest fields, the Fermi surface is well modelled with a small shift to increase the Fermi volume. As the field is reduced, we find better agreement with a larger shift corresponding to stronger hybridisation of 4f electrons. Finally, we present models for the topology of the Lifshitz transitions.

100% | Mobil-Ansicht | English Version | Kontakt/Impressum/Datenschutz
DPG-Physik > DPG-Verhandlungen > 2023 > SKM