Faculty Publications
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.
Department
Department of Physics
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
Recommended Citation
Deisz, J. J. and Kidd, T. E., "Weak-Coupling Analysis Of Quasiparticle Excitations In Sr2Ruo4 Along The Γ-M Cut" (2017). Faculty Publications. 930.
https://scholarworks.uni.edu/facpub/930
