Magnetic-Field Dependence of the YbRh2Si2 Fermi Surface
P.M.C. Rourke (1), A. McCollam (1), G. Lapertot (2), G. Knebel (2), J., Flouquet (2), S.R. Julian (1) ((1) Department of Physics, University of, Toronto, Canada, (2) DRFMC, SPSMS, CEA Grenoble, France)
TL;DR
This study uses de Haas-van Alphen measurements to observe how the Fermi surface of YbRh2Si2 changes with magnetic field, supporting a Lifshitz transition scenario without 4f electron localization.
Contribution
It provides direct experimental evidence of magnetic-field-dependent Fermi surface evolution in YbRh2Si2, supporting a Lifshitz transition model.
Findings
Fermi surface areas change with magnetic field
Majority-spin branch undergoes Lifshitz transition around 10 T
No evidence of 4f localization at transition
Abstract
Magnetic-field-induced changes of the Fermi surface play a central role in theories of the exotic quantum criticality of YbRh2Si2. We have carried out de Haas-van Alphen measurements in the magnetic-field range 8 T <= H <= 16 T, and directly observe field dependence of the extremal Fermi surface areas. Our data support the theory that a low-field "large" Fermi surface, including the Yb 4f quasihole, is increasingly spin split until a majority-spin branch undergoes a Lifshitz transition and disappears at H0 ~ 10 T, without requiring 4f localization at H0.
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Taxonomy
TopicsRare-earth and actinide compounds · Cold Atom Physics and Bose-Einstein Condensates · Physics of Superconductivity and Magnetism