Zeeman-driven Lifshitz transition: A scenario for the Fermi-surface reconstruction in YbRh2Si2

Details Zeeman-driven Lifshitz transition: A scenario for the Fermi-surface reconstruction in YbRh2Si2 Zeeman-driven Lifshitz transition: A scenario for the Fermi-surface reconstruction in YbRh2Si2

2010-12-01

arxiv.org/abs/1012.0303v1

Phys. Rev. Lett. 106, 137002 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figs

Scientific paper

10.1103/PhysRevLett.106.137002

The heavy-fermion metal YbRh2Si2 displays a field-driven quantum phase transition where signatures of a Fermi-surface reconstruction have been identified, often interpreted as breakdown of the Kondo effect. We argue that instead many properties of the material can be consistently described assuming a Zeeman-driven Lifshitz transition of narrow heavy-fermion bands. Using a suitable quasiparticle model, we find a smeared jump in the Hall constant and lines of maxima in susceptibility and specific heat, very similar to experimental data. An intermediate non-Fermi liquid regime emerges due to the small effective Fermi energy near the transition. Further experiments to discriminate the different scenarios are proposed.

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