Differences in optical conductivity between one- and two-dimensional dopednickelates

Authors
Tsutsui, K Koshibae, W Maekawa, S
Citation
K. Tsutsui et al., Differences in optical conductivity between one- and two-dimensional dopednickelates, PHYS REV B, 59(15), 1999, pp. 9729-9732
Citations number
13
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICAL REVIEW B-CONDENSED MATTER
ISSN journal
01631829 → ACNP
Volume
59
Issue
15
Year of publication
1999
Pages
9729 - 9732
Database
ISI
SICI code
0163-1829(19990415)59:15<9729:DIOCBO>2.0.ZU;2-Z
Abstract
We study the optical conductivity in doped nick:elates, and find the dramat ic difference of the spectrum in the gap (omega less than or similar to eV) between one- (1D) and two-dimensional (2D) nickelates. The difference is s hown to be caused by the dependence of hopping integral on dimensionality. The theoretical results explain consistently the experimental data in 1D an d 2D nickeletes, Y2-xCaxBaNiO5 and La2-xSrxNiO4, respectively. The relation between the spectrum in the x-ray aborption experiments and the optical co nductivity in La2-xSrxNiO4 is discussed. [S0163-1829(99)07515-3].