Formation of heavy d-electron quasiparticles in Sr3Ru 2O7

M. P. Allan, A. Tamai, E. Rozbicki, M. H. Fischer, J. Voss, P. D.C. King, W. Meevasana, S. Thirupathaiah, E. Rienks, J. Fink, D. A. Tennant, R. S. Perry, J. F. Mercure, M. A. Wang, Jinho Lee, C. J. Fennie, E. A. Kim, M. J. Lawler, K. M. Shen, A. P. MackenzieZ. X. Shen, F. Baumberger

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Abstract

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 Sr 3Ru2O7. 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.

Original languageEnglish
Article number063029
JournalNew Journal of Physics
Volume15
DOIs
StatePublished - Jun 2013

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