Evolution of the Fermi surface and quasiparticle renormalization through a van Hove singularity in Sr2-yLayRuO4

K. M. Shen, N. Kikugawa, C. Bergemann, L. Balicas, F. Baumberger, W. Meevasana, N. J. C. Ingle, Y. Maeno, Z. -X. Shen, A. P. Mackenzie

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55 Citations (Scopus)

Abstract

We employ a combination of chemical substitution and angle resolved photoemission spectroscopy to prove that the Fermi level in the gamma band of Sr2-gamma La gamma RuO4 can be made to traverse a van Hove singularity. Remarkably, the large mass renormalization has little dependence on either k or doping. By combining the results from photoemission with thermodynamic measurements on the same batches of crystals, we deduce a parametrization of the full many-body quasiparticle dispersion in Sr2RuO4 which extends from the Fermi level to approximately 20 meV above it.

Original languageEnglish
Pages (from-to)187001
Number of pages4
JournalPhysical Review Letters
Volume99
Issue number18
DOIs
Publication statusPublished - 2 Nov 2007

Keywords

  • SR2RUO4
  • SUPERCONDUCTIVITY
  • TRIPLET

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