β-YbAlB4: a critical nodal metal

We propose a model for the intrinsic quantum criticality of β-YbAlB(4), in which a vortex in momentum space gives rise to a new type of Fermi surface singularity. The unquenched angular momentum of the |J=7/2,m(J)=±5/2> Yb 4f states generates a momentum-space line defect in the hybridization betw...

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Bibliographic Details
Published inPhysical review letters Vol. 109; no. 17; p. 176404
Main Authors Ramires, Aline, Coleman, Piers, Nevidomskyy, Andriy H, Tsvelik, A M
Format Journal Article
LanguageEnglish
Published United States 26.10.2012
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Summary:We propose a model for the intrinsic quantum criticality of β-YbAlB(4), in which a vortex in momentum space gives rise to a new type of Fermi surface singularity. The unquenched angular momentum of the |J=7/2,m(J)=±5/2> Yb 4f states generates a momentum-space line defect in the hybridization between 4f and conduction electrons, leading to a quasi-two-dimensional Fermi surface with a k(⊥)(4) dispersion and a singular density of states proportional to E(-1/2). We discuss the implications of this line node in momentum space for our current understanding of quantum criticality and its interplay with topology.
ISSN:1079-7114
DOI:10.1103/PhysRevLett.109.176404