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Formation of heavy d-electron quasiparticles in Sr3Ru2O7

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Allan, M. P., Tamai, A., Rozbicki, E., Fischer, M. H., Voss, J., King, P. D. C., et al. (2013). Formation of heavy d-electron quasiparticles in Sr3Ru2O7. New Journal of Physics, 15: 063029, pp. 1-10. doi:10.1088/1367-2630/15/6/063029.

The phase diagram of Sr3Ru2O7 shows hallmarks of strong electron correlations despite the modest Coulomb interaction in the Ru 4d shell. We use angle-resolved photoelectron spectroscopy measurements to provide microscopic insight into the formation of the strongly renormalized heavy d-electron liquid that controls the physics of Sr3Ru2O7. Our data reveal itinerant Ru 4d-states confined over large parts of the Brillouin zone to an energy range of <6 meV, nearly three orders of magnitude lower than the bare band width. We show that this energy scale agrees quantitatively with a characteristic thermodynamic energy scale associated with quantum criticality and illustrate how it arises from a combination of back-folding due to a structural distortion and the hybridization of light and strongly renormalized, heavy quasiparticle bands. The resulting heavy Fermi liquid has a marked k-dependence of the renormalization which we relate to orbital mixing along individual Fermi surface sheets.