Publication details

Spin Polaron Theory for the Photoemission Spectra of Layered Cobaltates



Year of publication 2007
Type Article in Periodical
Magazine / Source Physical Review Letters
MU Faculty or unit

Faculty of Science

Field Solid matter physics and magnetism
Keywords strongly correlated electron systems; photoemission spectra; layered cobaltates; spin-polaron
Description 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 lineshapes are well reproduced by the theory.
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