Formation of heavy d-electron quasiparticles in Sr3Ru2O7
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 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.
Citation
Allan , M P , Tamai , A , Rozbicki , E J , Fischer , M H , Voss , J , King , P , Meevasana , W , Thirupathaiah , S , Rienks , E , Fink , J , Tennant , D A , Perry , R S , Mercure , J-F , Wang , M A , Lee , J , Fennie , C J , Kim , E-A , Lawler , M J , Shen , K M , Mackenzie , A , Shen , Z-X & Baumberger , F 2013 , ' Formation of heavy d-electron quasiparticles in Sr 3 Ru 2 O 7 ' , New Journal of Physics , vol. 15 , 063029 . https://doi.org/10.1088/1367-2630/15/6/063029
Publication
New Journal of Physics
Status
Peer reviewed
ISSN
1367-2630Type
Journal article
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