Spin polaron theory for the photoemission spectra of layered cobaltates

Details Spin polaron theory for the photoemission spectra of layered cobaltates Spin polaron theory for the photoemission spectra of layered cobaltates

2007-08-03

arxiv.org/abs/0708.0543v1

Phys. Rev. Lett. 99, 256406 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.99.256406

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 CoO_2 planes which is based on a fact of the spin-state quasidegeneracy of Co^{3+} 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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