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YbRh2Si2 is a model system for quantum criticality. Particularly, Hall effectmeasurements helped identify the unconventional nature of its quantum criticalpoint. Here, we present a high-resolution study of the Hall effect andmagnetoresistivity on samples of different quality. We find a robust crossoveron top of a sample dependent linear background contribution. Our detailedanalysis provides a complete characterization of the crossover in terms of itsposition, width, and height. Importantly, we find in the extrapolation to zerotemperature a discontinuity of the Hall coefficient occurring at the quantumcritical point for all samples. Particularly, the height of the jump in theHall coefficient remains finite in the limit of zero temperature. Hence, ourdata solidify the conclusion of a collapsing Fermi surface. Finally, wecontrast our results to the smooth Hall-effect evolution seen in Chromium, theprototype system for a spin-density-wave quantum critical point.

Discontinuous Hall coefficient at the quantum critical point in YbRh2Si2