Orbital mixing and nesting in the bilayer manganites La${}_{2-2x}$Sr${}_{1+2x}$Mn${}_2$O${}_7$

Abstract

A first principles study of La${}_{2-2x}$Sr${}_{1+2x}$Mn${}_2$O${}_7$ compounds for doping levels $0.3\le x\le 0.5$ shows that the low energy electronic structure of the majority spin carriers is determined by strong momentum dependent interactions between the Mn $e_g$ $d_{x^2-y^2}$ and $d_{3z^2-r^2}$ orbitals, which in addition to an $x$ dependent Jahn-Teller distortion, differ in the ferromagnetic and antiferromagnetic phases. The Fermi surface exhibits nesting behavior that is reflected by peaks in the static susceptibility, whose positions as a function of momentum have a non-trivial dependence on $x$.

4 pages, 5 figures, published

References in corpus (2)

• Polaron Coherence Condensation as the Mechanism for Colossal Magnetoresistance in Layered Manganites
• Non-gapped Fermi surfaces, quasiparticles and the anomalous temperature dependence of the near-$E_F$ electronic states in the CMR oxide La${}_{2-2x}$Sr${}_{1+2x}$Mn${}_2$O${}_7$ with $x=0.36$

Cited by in corpus (4)

• 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
• A Minimal tight-binding model for ferromagnetic canted bilayer manganites
• Theory for charge and orbital density-wave states in manganite La${}_{0.5}$Sr${}_{1.5}$MnO${}_4$
• CE-antiferromagnetic electronic structure in LaSr${}_2$Mn${}_2$O${}_7$ revealed by micro-focused angle-resolved photoemission spectroscopy and tight-binding models