A Minimal tight-binding model for ferromagnetic canted bilayer manganites

Abstract

Half-metallicity in materials has been a subject of extensive research due to its potential for applications in spintronics. Ferromagnetic manganites have been seen as a good candidate, and aside from a small minority-spin pocket observed in La${}_{2-2x}$Sr${}_{1+2x}$Mn${}_2$O${}_7$ $(x=0.38)$, transport measurements show that ferromagnetic manganites essentially behave like half metals. Here we develop robust tight-binding models to describe the electronic band structure of the majority as well as minority spin states of ferromagnetic, spin-canted antiferromagnetic, and fully antiferromagnetic bilayer manganites. Both the bilayer coupling between the MnO${}_2$ planes and the mixing of the $|x^2-y^2>$ and $|3z^2-r^2>$ Mn 3d orbitals play an important role in the subtle behavior of the bilayer splitting. Effects of $k_z$ dispersion are included.

arXiv comment18 pages, and 6 figures

References in corpus (13)

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• Quantum many-body interactions in digital oxide superlattices
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• Evolution of Mid-gap States and Residual 3-Dimensionality in La${}_{2-x}$Sr${}_x$CuO${}_4$
• Raising Bi-O bands above the Fermi energy level of hole-doped Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ and other cuprate superconductors
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• Structural distortions and model Hamiltonian parameters: from LSDA to a tight-binding description of LaMnO_3
• Role of Oxygen Electrons in the Metal-Insulator Transition in the Magnetoresistive Oxide La${}_{2-2x}$Sr${}_{1+2x}$Mn${}_2$O${}_7$ Probed by Compton Scattering
• Electron-lattice coupling and partial nesting as the origin of Fermi-Arcs in manganites
• Orbital mixing and nesting in the bilayer manganites La${}_{2-2x}$Sr${}_{1+2x}$Mn${}_2$O${}_7$
• Temperature dependent orbital degree of freedom in a bilayer manganite by magnetic Compton scattering
• Magnetic momentum density, Fermi surface and directional magnetic Compton profiles in LaSr${}_2$Mn${}_2$O${}_7$ and La${}_{1.2}$Sr${}_{1.8}$Mn${}_2$O${}_7$
• Extracting d-orbital occupancy from magnetic Compton scattering in bilayer manganites

Cited by in corpus (3)

• Low temperature dynamic polaron liquid in a manganite exhibiting colossal magnetoresistance
• Second Dome of Superconductivity in YBa${}_2$Cu${}_3$O${}_7$ at High Pressure
• CE-antiferromagnetic electronic structure in LaSr${}_2$Mn${}_2$O${}_7$ revealed by micro-focused angle-resolved photoemission spectroscopy and tight-binding models