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Abstract: The variation in the quasiparticle weight $Z$ on moving around the fermisurface in correlated metals is studied theoretically. Our primary example is aheavy Fermi liquid treated within the standard hybridization mean field theory.The most dramatic variation in the quasiparticle weight happens in situationswhere the hybridization vanishes along certain directions in momentum space.Such a -hybridization node- is demonstrated for a simplified model of aCerium-based cubic heavy electron metal. We show that the quasiparticle weightvaries from almost unity in some directions, to values approaching zero inothers. This is accompanied by a similar variation in the quasiparticleeffective mass. Some consequences of such hybridization nodes and theassociated angle dependence are explored. Comparisons to somewhat similarphenomena in the normal metallic state of the cuprate materials are discussed.A phenomenological picture of the pseudogap state in the cuprates with a largeFermi surface with a severely anisotropic spectral weight is explored.



Author: Pouyan Ghaemi, T. Senthil, P. Coleman

Source: https://arxiv.org/



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