Polarized optical reflectance and electronic structure of the charge-density-wave materials eta- and gamma-Mo4O11

Citation
Z. Zhu et al., Polarized optical reflectance and electronic structure of the charge-density-wave materials eta- and gamma-Mo4O11, PHYS REV B, 61(15), 2000, pp. 10057-10065
Citations number
48
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICAL REVIEW B
ISSN journal
1098-0121 → ACNP
Volume
61
Issue
15
Year of publication
2000
Pages
10057 - 10065
Database
ISI
SICI code
1098-0121(20000415)61:15<10057:PORAES>2.0.ZU;2-5
Abstract
We report the polarized optical reflectance spectra of eta- and gamma-Mo4O1 1 as a function of temperature and magnetic field. Excitations are assigned and analyzed based upon eletronic band-structure calculations. The 300 K s pectra of eta- and gamma-Mo4O11 show charge transfer transitions (O 2p --> Mo 4d) near 4 eV, intraband (d --> d) transitions at similar to 1.5 eV, and a free carrier response at lower energy. The intraband (did) transition sh ows strong and unusual anisotropy in the b and c directions, which is direc tly attributable to the dispersion relations of the lower-lying d-block ban ds. The effect of charge density wave formation on the optical properties o f eta- and gamma-Mo4O11 is discussed and compared with related materials. T he magnetic field dependence of the optical constants is determined for eta -Mo4O11 and discussed in terms of field effects on the nesting vector and F ermi surface.