Evolution of magnetic oxygen states in Sr-doped LaCoO3

Evolution of magnetic oxygen states in Sr-doped LaCoO3

Magnetism in La(1-x)Sr(x)CoO(3) as a function of doping is investigated with x-ray absorption spectroscopy and x-ray magnetic circular dicrhoism at the O K edge, and corresponding first principles electronic structure calculations. For small x, the spectra are consistent with the formation of ferrom...

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Veröffentlicht in:Physical Review Letters 2012-10, Vol.109 (15), p.157204-157204
Hauptverfasser: Medling, S, Lee, Y, Zheng, H, Mitchell, J F, Freeland, J W, Harmon, B N, Bridges, F
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container_issue 15
container_start_page 157204
container_title Physical Review Letters
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creator Medling, S
Lee, Y
Zheng, H
Mitchell, J F
Freeland, J W
Harmon, B N
Bridges, F
description Magnetism in La(1-x)Sr(x)CoO(3) as a function of doping is investigated with x-ray absorption spectroscopy and x-ray magnetic circular dicrhoism at the O K edge, and corresponding first principles electronic structure calculations. For small x, the spectra are consistent with the formation of ferromagnetic clusters occurring within a nonmagnetic insulating matrix. Sr-induced, magnetic O-hole states form just above E(F) and grow with increasing Sr doping. Density functional calculations for x=0 yield a nonmagnetic ground state with the observed rhombohedral distortion and indicates that doping introduces holes at the Fermi level in magnetic states with significant O 2p and Co t(2g) character for the undistorted pseudocubic structure. Supercell calculations show stronger magnetism on oxygen atoms having more Sr neighbors.
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title Evolution of magnetic oxygen states in Sr-doped LaCoO3
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