Temperature dependent orbital degree of freedom in a bilayer manganite by magnetic Compton scattering

Abstract

We have measured temperature-dependent magnetic Compton profiles (MCPs) from a single crystal of La${}_{1.2}$Sr${}_{1.8}$Mn${}_2$O${}_7$. The MCPs, which involved the scattering of circularly polarized x-rays, are in general related to the momentum density of all the unpaired spins in the system. Nevertheless, we show that when the x-ray scattering vector lies along the [110] direction, the number of magnetic electrons of a specific symmetry, i.e. $d$-electrons of $x^2-y^2$ symmetry, yield a distinct signature in the MCP, allowing us to monitor substantial changes in the occupancy of the $d_{x^2-y^2}$ states over the investigated temperature range of 5-200K. This study indicates that magnetic Compton scattering can provide a powerful window on the properties of specific magnetic electrons in complex materials.

arXiv comment5 pages, 4 figures, to appear in Phys. Rev. Lett

References in corpus (6)

• Electronic structure and magnetism of Fe${}_{3-x}$V${}_x$X (X = Si, Ga and Al) alloys by the KKR-CPA method
• Charge melting and polaron collapse in $L{a}_{1.2}S{r}_{1.8}M{n}_2{O}_7$
• Neutron Scattering Studies on Magnetic Structure of the Double-Layered Manganite La_{2-2x}Sr_{1+2x}Mn_2O_7 ($0.30\le x\le 0.50$)
• Treatment of Correlation Effects in Electron Momentum Density: Density Fuctional Theory and Beyond
• Ab initio calculations of the hydrogen bond
• Influence of Quasi-Bi-Stripe Charge Order on the Resistivity and Magnetism in a Bilayer Manganite La${}_{2-2x}$Sr${}_{1+2x}$Mn${}_2$O${}_7$

Cited by in corpus (7)

• 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
• Spin moment over 10-300 K and delocalization of magnetic electrons above the Verwey transition in magnetite
• Orbital mixing and nesting in the bilayer manganites La${}_{2-2x}$Sr${}_{1+2x}$Mn${}_2$O${}_7$
• Identification of ferrimagnetic orbitals preventing spinel degradation by charge ordering in Li${}_x$Mn${}_2$O${}_4$
• 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
• A Minimal tight-binding model for ferromagnetic canted bilayer manganites