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

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(2) DRFMC SPSMS CEA Grenoble France)

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classification ❄️ cond-mat.str-el

keywords fermisurfacedependencemagnetic-fieldybrh2si2alphenareasbranch

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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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Magnetic-Field Dependence of the YbRh2Si2 Fermi Surface

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