Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2004-10-21
Phys. Rev. Lett. 93, 207206 (2004)
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages, 4 figures, to appear in Phys. Rev. Lett
Scientific paper
10.1103/PhysRevLett.93.207206
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.
Bansil Arun
Barbiellini Bernardo
Kaprzyk Stanislaw
Li Yinwan
Mijnarends P. E.
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