Spin polaron theory for the photoemission spectra of layered cobaltates

Chaloupka, J.; Khaliullin, G.

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Spin polaron theory for the photoemission spectra of layered cobaltates

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Chaloupka, J.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Khaliullin, G.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Chaloupka, J., & Khaliullin, G. (2007). Spin polaron theory for the photoemission spectra of layered cobaltates. Physical Review Letters, 99(25): 256406.

Cite as: https://hdl.handle.net/21.11116/0000-000E-B651-9

Abstract

Recently, strong reduction of the quasiparticle peaks and pronounced incoherent structures have been observed in the photoemission spectra of layered cobaltates. Surprisingly, these many-body effects are found to increase near the band-insulator regime. We explain these unexpected observations in terms of a novel spin-polaron model for CoO2 planes, which is based on a fact of the spin-state quasidegeneracy of Co3+ ions in oxides. Scattering of the photoholes on spin-state fluctuations suppresses their coherent motion. The observed "peak-dip-hump" type line shapes are well reproduced by the theory.