Lifshitz transitions and quasiparticle de-renormalization in YbRh${}_2$Si${}_2$

Abstract

We study the effect of magnetic fields up to 15 T on the heavy fermion state of YbRh${}_2$Si${}_2$ via Hall effect and magnetoresistance measurements down to 50 mK. Our data show anomalies at three different characteristic fields. We compare our data to renormalized band structure calculations through which we identify Lifshitz transitions associated with the heavy fermion bands. The Hall measurements indicate that the de-renormalization of the quasiparticles, {\it i.e} the destruction of the local Kondo singlets, occurs smoothly while the Lifshitz transitions occur within rather confined regions of the magnetic field.

7 pages, 5 figures

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• Lifshitz Transitions in Magnetic Phases of the Periodic Anderson Model
• Hall anomaly, Quantum Oscillations and Possible Lifshitz Transitions in Kondo Insulator YbB${}_{12}$: Evidence for Unconventional Charge Transport
• Field induced Lifshitz transition in UPt${}_2$Si${}_2$: Fermi surface under extreme conditions
• Transport Spectroscopy of the Field Induced Cascade of Lifshitz Transitions in YbRh2Si2
• Microstructuring YbRh2Si2 for resistance and noise measurements down to ultra-low temperatures
• Anisotropic Zeeman Splitting in YbNi4P2