Charge transfer transitions in cuprates
Artikel i vetenskaplig tidskrift, 2010

Absorption spectra of cuprates are discussed. Persistent photo-induced conductivity occurs in the visible spectrum (similar to 2 eV) and is commonly assigned to ligand-metal (LM) charge transfer (CT) transitions. However, LM CT is site local and cannot possibly generate persistent charges. The assignment in this Letter is 'metal to adjacent metal' (MM) CT transitions, while the absorption at hv > 3 eV is still assigned to mainly LM CT. Only MM CT, defining the Mott-Hubbard gap, is exclusively polarized in the CuO2 plane, as found experimentally. Since MM CT is strongly affected by the local electric field, doping transfers spectral weight to the IR region. (C) 2010 Published by Elsevier B.V.

LA2CUO4

MIDINFRARED SPECTRUM

MULTIMAGNON OPTICAL-ABSORPTION

SINGLE-CRYSTALS

TEMPERATURE-DEPENDENCE

MIXED-VALENCE

EXCITATIONS

LAMELLAR COPPER OXIDES

ELECTRONIC-SPECTRA

CS2SBCL6

SUPERCONDUCTORS

Författare

Sven Larsson

Chalmers, Kemi- och bioteknik, Fysikalisk kemi

Chemical Physics Letters

0009-2614 (ISSN)

Vol. 491 1-3 49-53

Ämneskategorier

Kemi

DOI

10.1016/j.cplett.2010.03.076