Weak-Coupling Analysis Of Quasiparticle Excitations In Sr2Ruo4 Along The Γ-M Cut
Physical Review B
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 of Physics
Original Publication Date
DOI of published version
UNI ScholarWorks, Rod Library, University of Northern Iowa
Deisz, J. J. and Kidd, T. E., "Weak-Coupling Analysis Of Quasiparticle Excitations In Sr2Ruo4 Along The Γ-M Cut" (2017). Faculty Publications. 930.