Formation of heavy d-electron quasiparticles in Sr3Ru2O7
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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.
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 . DOI: 10.1088/1367-2630/15/6/063029
New Journal of Physics
© 2013 IOP Publishing and Deutsche Physikalische Gesellschaft. M P Allan et al 2013 New J. Phys. 15 063029. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
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