Naslov
Crystal-Field-Induced Electron-Phonon Coupling and Polarons in La2CuO4

Autori
Barišić, Slaven ; Batistić, Ivo

Izvornik
Europhysics Letters (0302-072X) 8 (1989), 8; 765-770

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
high temperature superconductor; lattice localised modes; polaron stability

Sažetak
The main contribution to the electron-phonon coupling in ionic metals with strongly correlated electrons is attributed to the deformation-induced variation of the crystal field on those ionic sites which are involved in conduction. In layered-metal oxides the latter are assumed to be the oxygen sites of the CuO/sub 2/ planes. The coupling of the holes on those sites to a representative deformation mode in lanthanum compounds is evaluated using the point charge approximation and the Ewald method. Particular attention is devoted to the orthorhombic-to-tetragonal instability and to the formation of the corresponding polarons in the presence of a small number of holes. The stability of such polarons is discussed in detail.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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