(LASE)(1.14)(NBSE2)(2) - A METAL-INSULATOR QUANTUM-WELL CRYSTAL

We report on the polarized IR and Raman study of the misfit layer comp ound (LaSe)(1.14)(NbSe2)(2). The obtained data were compared with thos e obtained on the parent layer compounds LaSe and NbSe2. On an assumpt ion of a charge transfer of 1.14 electrons per formula unit from the L aSe to the NbSe2 layers the decrease of the plasma frequency in the mi sfit compound with respect to that in the parent layer compounds is qu alitatively explained. A qualitative model of electronic structure for mation of the misfit layer compound from electronic bands of the paren t layer compounds is discussed. An in-plane optical anisotropy related to the small misfit between the LaSe and NbSe2 layer structures has b een detected.