CPL - Chalmers Publication Library
| Utbildning | Forskning | Styrkeområden | Om Chalmers | In English In English Ej inloggad.

Charge transfer transitions in cuprates

Sven Larsson (Institutionen för kemi- och bioteknik, Fysikalisk kemi)
Chemical Physics Letters (0009-2614). Vol. 491 (2010), 1-3, p. 49-53.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: LAMELLAR COPPER OXIDES, MULTIMAGNON OPTICAL-ABSORPTION, MIXED-VALENCE, CS2SBCL6, TEMPERATURE-DEPENDENCE, MIDINFRARED SPECTRUM, ELECTRONIC-SPECTRA, SINGLE-CRYSTALS, EXCITATIONS, SUPERCONDUCTORS, LA2CUO4



Denna post skapades 2010-06-08.
CPL Pubid: 122475

 

Läs direkt!


Länk till annan sajt (kan kräva inloggning)


Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Fysikalisk kemi (2005-2014)

Ämnesområden

Kemi

Chalmers infrastruktur