Tight-binding Hamiltonians for Sr filled ruthenates: application to the gap anisotropy and Hall coefficient in Sr2RuO4

Details Tight-binding Hamiltonians for Sr filled ruthenates: application to the gap anisotropy and Hall coefficient in Sr2RuO4 Tight-binding Hamiltonians for Sr filled ruthenates: application to the gap anisotropy and Hall coefficient in Sr2RuO4

1999-07-28

arxiv.org/abs/cond-mat/9907442v1

Physics

Condensed Matter

Materials Science

11 Revtex pages, 5 embedded figs

Scientific paper

10.1103/PhysRevB.61.5223

Accurate orthogonal tight-binding Hamiltonians are constructed for ferromagnetic SrRuO$_3$ and the layered perovskite superconductor, Sr$_2$RuO$_4$ by fitting to all-electron full-potential local density band structures obtained by the linearized augmented planewave method. These Hamiltonians allow the band structure to be computed on very fine meshes in the Brillouin zone at low cost, and additionally have analytic band velocities, while retaining the accuracy of the full-potential electronic structure calculations. This greatly facilitates calculation of transport and superconducting parameters related to the fermiology. These features are exploited to calculate the Hall coefficient and vortex lattice geometry for Sr$_2$RuO$_4$ with fine integration meshes. We find the lower limit for the interband order parameter anisotropy to be compatible with the observed square geometry. We also find that the sign reversal of the Hall coefficient can be explained in a conventional way if the bands are shifted by a few mRy so as to match the experimental de Haas-van Alphen areas exactly, {\it and} the temperature dependence of the relaxation time is strongly dependent on the band character.

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