Spin Polaron Theory for the Photoemission Spectra of Layered Cobaltates
| Authors | |
|---|---|
| Year of publication | 2007 |
| Type | Article in Periodical |
| Magazine / Source | Physical Review Letters |
| MU Faculty or unit | |
| Citation | |
| 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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