We investigate the temperature and doping dependences of the midinfrared band in the optical conductivity of electron-doped cuprates in terms of magnetic/lattice polaron formation. We employ dynamical mean-field theory in the context of the Holstein-t-J model for the specific case of Nd2-xCexCuO4. We find that the onset of short-range magnetic correlations at the pseudogap temperature triggers the formation of the lattice polaron responsible for the midinfrared band.
Polaronic signatures in the optical properties of the electron-doped cuprate superconductor Nd2-xCexCuO4
E. Cappelluti;S. Ciuchi;S. Fratini
2009
Abstract
We investigate the temperature and doping dependences of the midinfrared band in the optical conductivity of electron-doped cuprates in terms of magnetic/lattice polaron formation. We employ dynamical mean-field theory in the context of the Holstein-t-J model for the specific case of Nd2-xCexCuO4. We find that the onset of short-range magnetic correlations at the pseudogap temperature triggers the formation of the lattice polaron responsible for the midinfrared band.File in questo prodotto:
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Descrizione: Polaronic signatures in the optical properties of the electron-doped cuprate superconductor Nd2−xCexCuO4
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