title: Magnetic-field dependence of the YbRh2Si2 Fermi surface.
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 < or = H < or = 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 approximately 10 T, without requiring 4f localization at H0.
authors.affiliation: Department of Physics, University of Toronto, Toronto, ON M5S 1A7, Canada. p.rourke@utoronto.ca
authors.forename: P M C
authors.initials: PM
authors.lastname: Rourke
authors.forename: A
authors.initials: A
authors.lastname: McCollam
authors.forename: G
authors.initials: G
authors.lastname: Lapertot
authors.forename: G
authors.initials: G
authors.lastname: Knebel
authors.forename: J
authors.initials: J
authors.lastname: Flouquet
authors.forename: S R
authors.initials: SR
authors.lastname: Julian