Zeeman-Driven Lifshitz Transition: A Model for the Experimentally Observed Fermi-Surface Reconstruction in YbRh_2Si_2
- Creators
- Hackl, Andreas
- Vojta, Matthias
Abstract
The heavy-fermion metal YbRh_2Si_2 displays a field-driven quantum phase transition where signatures of a Fermi-surface reconstruction have been identified, often interpreted as a breakdown of the Kondo effect. We argue that instead many properties of the material can be consistently described by 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.
Additional Information
© 2011 American Physical Society. Received 10 December 2010; published 29 March 2011. We enjoyed extensive exchange with M. Brando, P. Gegenwart, and O. Stockert, who suggested the relevance of Zeeman physics in YbRh_2Si_2. We further thank S. Friedemann, A. Rosch, F. Steglich, and P. Wölfle for discussions. This research was supported by DFG FOR 960Attached Files
Published - Hackl2011p13542Phys_Rev_Lett.pdf
Files
Name | Size | Download all |
---|---|---|
md5:6a43d65aa8b60fb1eeb20ec1a9efa230
|
284.6 kB | Preview Download |
Additional details
- Eprint ID
- 23469
- Resolver ID
- CaltechAUTHORS:20110426-111939363
- FOR 960
- Deutsche Forschungsgemeinschaft (DFG)
- Created
-
2011-04-26Created from EPrint's datestamp field
- Updated
-
2021-11-09Created from EPrint's last_modified field