Optical Properties of the Spin-Ladder Compound Sr_{14}Cu_{24}O_{41}

Details Optical Properties of the Spin-Ladder Compound Sr_{14}Cu_{24}O_{41} Optical Properties of the Spin-Ladder Compound Sr_{14}Cu_{24}O_{41}

2000-05-04

arxiv.org/abs/cond-mat/0005096v1

Phys. Rev. B 62, 4963 (2000)

Physics

Condensed Matter

Strongly Correlated Electrons

22 pages, 9 figures, Phys. Rev. B, to be published

Scientific paper

10.1103/PhysRevB.62.4963

We report the measurements of the pseudodielectric function, far-infrared reflectivity and Raman scattering spectra in Sr_{14}Cu_{24}O_{41} single crystal. We study the lattice and the spin dynamics of the Cu$_2$O$_3$ spin ladders and CuO$_2$ chains of this compound. The ellipsometric and the optical reflectivity measurements yield the gap values of 1.4 eV, 1.86 eV, 2.34 eV (2.5 eV) for the ladders (chains) along the {\bf c}-axis and 2.4 eV along the {\bf a}-axis. The electronic structure of the Cu$_2$O$_3$ ladders is analyzed using tight-binding approach for the correlated electron systems. The correlation gap value of 1.4 eV is calculated with the transfer energy (hopping) parameters $t=t_{0}$=0.26 eV, along and perpendicular to legs, $t_{xy}$=0.026 eV (interladder hopping) and U=2.1 eV, as a Coulomb repulsion. The optical parameters of the infrared active phonons and plasmons are obtained by oscillator fitting procedure of the reflectivity spectra. Raman scattering spectra are measured at different temperatures using different laser line energies. The two-magnon peak is observed at about 2880 cm$^{-1}$. At temperatures below 150 K the new infrared and Raman modes appear due to the charge ordering.

Affiliated with

Also associated with

No associations

Rating

Optical Properties of the Spin-Ladder Compound Sr_{14}Cu_{24}O_{41} does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Optical Properties of the Spin-Ladder Compound Sr_{14}Cu_{24}O_{41}, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical Properties of the Spin-Ladder Compound Sr_{14}Cu_{24}O_{41} will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-386029