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 $x$.

arXiv comment4 pages, 5 figures, published

References in corpus (11)

• Complexity in Strongly Correlated Electronic Systems
• Fermi Surface Nesting and Nanoscale Fluctuating Charge/Orbital Ordering in Colossal Magnetoresistive Oxides
• Charge melting and polaron collapse in $L{a}_{1.2}S{r}_{1.8}M{n}_2{O}_7$
• Relation between crystal and magnetic structures of the layered manganites La2-2xSr1+2xMn2O7 (0.30 =< x =< 0.50)
• Polaron Coherence Condensation as the Mechanism for Colossal Magnetoresistance in Layered Manganites
• Quasiparticle-like peaks, kinks, and electron-phonon coupling at the ($\pi$,0) regions in the CMR oxide La${}_{2-2x}$Sr${}_{1+2x}$Mn${}_2$O${}_7$
• The Structure of Nanoscale Polaron Correlations in La1.2Sr1.8Mn2O7
• 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 $x=0.36$
• 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 (8)

• 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
• Etching of Cr tips for scanning tunneling microscopy of cleavable oxides
• Response of acoustic phonons to charge and orbital order in the 50\% doped bilayer manganite LaSr${}_2$Mn${}_2$O${}_7$
• 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${}_4$
• On the origin of CE-type orbital fluctuations in the ferromagnetic metallic La${}_{1.2}$Sr${}_{1.8}$Mn${}_2$O${}_7$
• CE-antiferromagnetic electronic structure in LaSr${}_2$Mn${}_2$O${}_7$ revealed by micro-focused angle-resolved photoemission spectroscopy and tight-binding models