Faculty Publications

Title

Weak-coupling analysis of quasiparticle excitations in Sr2RuO4 along the Γ-M cut

Document Type

Article

Journal/Book/Conference Title

Physical Review B

Volume

95

Issue

4

Abstract

We examine normal-state quasiparticle excitations along the Γ-M cut in momentum space for the putative p-wave superconductor Sr2RuO4 on the basis of fluctuation exchange approximation calculations. We take as input first-principles derived parameters for the band structure and spin-orbit and electron-electron interactions. The numerical results are in excellent agreement with data from photoemission experiments and provide insight into the underlying quasiparticle properties. We find that, despite the correlation-induced effective mass increase near the Fermi surface, the full β and γ bandwidths are, if anything, increased by correlations. Furthermore, for the γ band we find anomalous lifetime broadening and a significant temperature of variation of unoccupied state quasiparticle energies for temperatures between 25 and 100 K, both of which are accounted for by the momentum dependence of the electron self-energy. In addition to aiding our understanding of experimental data, these results point to the challenge of assigning appropriate Fermi-liquid parameters or momentum-independent self-energies for schemes that require such approximations in order to model Sr2RuO4.

Original Publication Date

1-17-2017

DOI of published version

10.1103/PhysRevB.95.045122

Repository

UNI ScholarWorks, Rod Library, University of Northern Iowa

Language

en

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