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Article Dans Une Revue Physical Review Letters Année : 2006

Localized and Delocalized Excitons: Resonant Inelastic X-Ray Scattering in La2

Résumé

The dynamics of doped charge in an antiferromagnetic lattice is central to the description of the insulator-metal transition that occurs on doping the parent high Tc compounds. In this work we use high resolution resonant inelastic x-ray scattering to investigate the dynamics of the charge-transfer exciton by measuring its energy dispersion in two prototype compounds, La2CuO4 and La2NiO4. We show that this behavior is radically different in the cuprate with respect to a system known to exhibit strong polaronic behavior, namely, the nickelate: the exciton is mobile in the cuprate while it is well localized in the nickelate. Using a simple Wannier-Mott model we can estimate the total hole plus electron effective mass in the cuprate to be 3.5±0.3me which would exclude strong localization in the undoped cuprate.
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hal-00128213 , version 1 (29-04-2024)

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Emilie Collart, Abhay Shukla, Jean-Pascal Rueff, Philippe Leininger, Hirofumi Ishii, et al.. Localized and Delocalized Excitons: Resonant Inelastic X-Ray Scattering in La2. Physical Review Letters, 2006, 96 (15), pp.157004. ⟨10.1103/PhysRevLett.96.157004⟩. ⟨hal-00128213⟩
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