Field-induced Orbital Patterns in Ferromagnetic Layered Ruthenates

Abstract

We study the evolution of orbital patterns in ferromagnetic layered ruthenates due to the competition of Coulomb interactions, compressive c axis and orthorhombic distortions in the presence of a polarizing orbital field coupled to the angular momentum. By means of the exact diagonalization on a 2x2 cluster and a cluster embedded analysis where inter-plaquette interaction is treated on mean field level, we determine the ground-state phase diagram. Specifically, we demonstrate that, via the activation of two or three of t_2g local orbital configurations, an external field applied along different symmetry directions can lead to inequivalent orbital correlated states. Starting from an antiferro-orbital pattern, for the easy axis case an orbital ordered phase is induced, having strong next nearest neighbors ferro-orbital correlations. Otherwise, a field applied along the hard axis leads a reduction of local orbital moment in a way to suppress the orbital order.

11 pages

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• Resistivity measurements unveil microscopic properties of CrAs
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• Intra-chain collinear magnetism and inter-chain magnetic phases in Cr3As3-K-based materials
• Optimizing the tight-binding parametrization of the quasi-one-dimensional superconductor K2Cr3As3
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• Resonant Inelastic X-ray Scattering Study of Ca${}_3$Ru${}_2$O${}_7$
• Mott-Insulator Ca2RuO4 under a static external electric field
• Spin-orbital mechanisms for negative thermal expansion in Ca2RuO${}_4$
• Emerging new phases in correlated Mott insulator Ca2RuO4
• Anomalous orbital moment in the ferromagnetic phase of the Sr4Ru3O10
• Structural and metal-insulator transitions in ionic liquid-gated Ca3Ru2O7 surface
• Unrestricted Hartree-Fock Analysis of Sr${}_{3-x}$Ca${}_x$Ru${}_2$O${}_7$