CC BY 3.0 UnportedAllan, M.P.Tamai, A.Rozbicki, E.Fischer, M.H.Voss, J.King, P.D.C.Meevasana, W.Thirupathaiah, S.Rienks, E.Fink, J.Tennant, D.A .Perry, R.S.Mercure, J.F.Wang, M.A.Lee, JinhoFennie, C.J.Kim, E.A.Lawler, M.J.Shen, K.M.Mackenzie, A.P.Shen, Z.X.Baumberger, F.2018-06-112019-06-282013https://doi.org/10.34657/1523https://oa.tib.eu/renate/handle/123456789/4364The 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.application/pdfenghttps://creativecommons.org/licenses/by/3.0/530Angle resolved photoelectron spectroscopyBrillouin zonesQuantum criticalityQuasiparticle bandsStrong electron correlationsStructural distortionsThermodynamic energyThree orders of magnitudeArticle