Difference of optical conductivity between one- and two-dimensional doped nickelates

Details Difference of optical conductivity between one- and two-dimensional doped nickelates Difference of optical conductivity between one- and two-dimensional doped nickelates

1999-01-22

arxiv.org/abs/cond-mat/9901235v1

Phys.Rev. B 59, 9729 (1999)

Physics

Condensed Matter

Strongly Correlated Electrons

RevTeX, 4 pages, 4 figures

Scientific paper

10.1103/PhysRevB.59.9729

We study the optical conductivity in doped nickelates, and find the dramatic difference of the spectrum in the gap ($\omega$$\alt$4 eV) between one- (1D) and two-dimensional (2D) nickelates. The difference is shown to be caused by the dependence of hopping integral on dimensionality. The theoretical results explain consistently the experimental data in 1D and 2D nickelates, Y$_{2-x}$Ca$_x$BaNiO$_5$ and La$_{2-x}$Sr$_x$NiO$_4$, respectively. The relation between the spectrum in the X-ray aborption experiments and the optical conductivity in La$_{2-x}$Sr$_x$NiO$_4$ is discussed.

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