LDA+Slave-Boson approach to the correlated electronic structure of the metamagnetic bilayer ruthenate Sr${}_3$Ru${}_2$O${}_7$

Abstract

The combination of the local-density approximation (LDA) with the rotationally invariant slave-boson theory (RISB) is used to investigate the realistic correlated electronic structure of Sr${}_3$Ru${}_2$O${}_7$. From Wannier-downfolding the low-energy band structure to a three-band model for the Ru($t_{2g}$) states, the interacting problem is solved including intra- and inter-orbital Hubbard terms as well as spin-flip and pair-hopping interactions. Therewith it is possible to obtain valuable insight into the orbital occupations, relevant local spin multiplets and the fermiology with increasing correlation strength. Besides generic correlation-induced band-narrowing and -shifting, an intriguing quasiparticle structure close to the Fermi level is found in the neigborhood of the notorious ${\gamma }_2$ pocket in the Brillouin zone. Along the $\Gamma$$-$$X$ direction in {\bf k}-space, that structure appears very sensitive to electronic self-energy effects. The subtle sensitivity, connected also its manifest multi-orbital character, may put this very low-energy structure in context with the puzzling metamagnetic properties of the compound.

reference added, published version

References in corpus (6)

• Formation of a Nematic Fluid at High Fields in Sr3Ru2O7
• The coherence-incoherence crossover and the mass-renormalization puzzles in Sr2RuO4
• Rotationally-invariant slave-boson formalism and momentum dependence of the quasiparticle weight
• Fermi surface and van Hove singularities in the itinerant metamagnet Sr3Ru2O7
• Evidence for strong electronic correlations in the spectra of Sr${}_2$RuO${}_4$
• Metamagnetic quantum criticality in Sr3Ru2O7 studied by thermal expansion

Cited by in corpus (17)

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• Structural and electronic properties of Sr2RuO4-Sr3Ru2O7 heterostructure
• Formation and consequences of heavy d-electron quasiparticles in Sr3Ru2O7
• Critical role of electronic correlations in determining crystal structure of transition metal compounds
• High chemical activity of a perovskite surface: reaction of CO with Sr${}_3$Ru${}_2$O${}_7$
• Numerical minimisation of Gutzwiller energy functionals
• Half-metallic ferromagnetism in Sr${}_3$Ru${}_2$O${}_7$
• Spin-orbit and anisotropic strain effects on the electronic correlations of Sr${}_2$RuO${}_4$
• State-of-the-art techniques for calculating spectral functions in models for correlated materials
• Accuracy of ghost-rotationally-invariant slave-boson theory for multiorbital Hubbard models and realistic materials
• Operatorial formulation of the ghost rotationally-invariant slave-Boson theory
• Competing magnetic orders in quantum critical Sr${}_3$Ru${}_2$O${}_7$
• Charge self-consistent density functional theory plus ghost rotationally-invariant slave-boson theory for correlated materials
• Efficient slave-boson approach for multiorbital two-particle response functions and superconductivity