Accession Number : ADA131516

Title :   Correlation and Collective Modes in Narrow Band Materials.

Descriptive Note : Interim rept. 1 Oct 81-30 Sep 82,


Personal Author(s) : Ribarsky,Martin W

PDF Url : ADA131516

Report Date : 25 May 1983

Pagination or Media Count : 28

Abstract : Correlation and collective modes have been studied for systems with quite localized valence or conduction bands. In particular this research has been concerned with localized electron-hole states and how they contribute with other excitations to the dynamical response of the system. Important aspects studied have been the effects of exciton or exciton-like states on superconducting properties electron energy loss spectra and optical spectra. Initially the system studied has been CuC1 for which a tight-binding model was used. The results show that strong effects due to localized excitations of b-band electrons greatly affect the dynamical response and the effective electron interaction. The exciton resonance in the dynamical response is necessary to obtain the appropriate attractive effective electron interaction for superconductivity. The strong localization effects also will affect the loss spectra and optical spectra. Further calculations are planned for CuC1 and also for CdS and Cu20. (Author)

Descriptors :   *Narrowband, *Materials, *Transition metals, Excitons, Excitation, Holes(Electron deficiencies), Copper compounds, Energy bands, Dielectrics, Dynamics, Optical properties

Subject Categories : Physical Chemistry
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE