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TT: Fachverband Tiefe Temperaturen

TT 11: Heavy Fermions

TT 11.2: Vortrag

Montag, 18. März 2024, 15:15–15:30, H 3005

High-pressure Fermi surface studies in the Kondo lattice system YbPtBi — •Oliver Squire, Maximilian Daschner, Jiasheng Chen, Patricia Alireza, and Malte Grosche — Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, United Kingdom

Quantum oscillation measurements provide valuable information about the electronic properties of heavy fermion materials. By performing these measurements under hydrostatic pressure, it is possible to detect the Fermi surface and quasiparticle mass enhancement at interesting points of the phase diagram, and to measure their evolution as the strengths of Kondo and magnetic interactions are varied.

Tunnel diode oscillator (TDO) circuits offer a technique to detect quantum oscillations in the skin depth and magnetisation of samples with high precision, and can be extended to high hydrostatic pressures using microcoils in anvil cells [1]. Using the TDO technique, we have performed a quantum oscillation study on the heavy fermion semimetal YbPtBi, measuring the variation of its Fermi surface properties as the material is tuned by pressure. We will discuss the role of f-electrons and the field dependence of the Fermi surface by comparing our results to electronic structure calculations and other RPtBi compounds.

[1] Semeniuk et al., PNAS 120 (2023) e2301456120.

Keywords: Fermi surface; YbPtBi; Tunnel diode oscillator; Pressure