Multi-orbital physics in Fermi liquids prone to magnetic order

Abstract

The interplay of spin-orbit-coupling and strong electronic correlations is studied for the single-layer and the bilayer compound of the strontium ruthenate Ruddlesden-Popper series by a combination of first-principles band-structure theory with mean-field rotationally invariant slave bosons. At equilibrium strongly renormalized (spin-orbit-split) quasiparticle bands are traced and a thorough description of the low-energy regime for the nearly ferromagnetic bilayer system in accordance with experimental data is presented. The metamagnetic response of Sr${}_3$Ru${}_2$O${}_7$ in finite magnetic field $H$ is verified and a detailed analysis of the underlying correlated electronic structure provided. Intriguing multi-orbital physics on both local and itinerant level, such as e.g. competing paramagnetic and diamagnetic contributions, is observed with important differences depending on the magnetic-field angle $\theta$ with the crystallographic c axis.

15 pages, 19 figures

References in corpus (12)

• Formation of a Nematic Fluid at High Fields in Sr3Ru2O7
• The coherence-incoherence crossover and the mass-renormalization puzzles in Sr2RuO4
• Strong spin-orbit coupling effects on the Fermi surface of Sr2RuO4 and Sr2RhO4
• Rotationally-invariant slave-boson formalism and momentum dependence of the quasiparticle weight
• Fermi surface and van Hove singularities in the itinerant metamagnet Sr3Ru2O7
• Metamagnetism of itinerant electrons in multi-layer ruthenates
• Metamagnetic quantum criticality in Sr3Ru2O7 studied by thermal expansion
• Evidence for strong electronic correlations in the spectra of Sr${}_2$RuO${}_4$
• Unconventional metamagnetic electron states in orbital band systems
• Meta-nematic transitions in a bilayer system: Application to the bilayer ruthenate
• Symmetry-breaking lattice distortion in Sr_3Ru_2O_7
• Quasiparticle Interference in the Unconventional Metamagnetic Compound Sr${}_3$Ru${}_2$O${}_7$