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Title: Optical properties of the spin-ladder compound Sr14Cu24O41
Authors: Popovic, ZV ×
Konstantinovic, MJ
Ivanov, VA
Khuong, OP
Gajic, R
Vietkin, A
Moshchalkov, Victor #
Issue Date: 2000
Publisher: AMERICAN PHYSICAL SOC
Series Title: Physical review. B, Condensed matter vol:62 issue:8 pages:4963-4972
Conference: date:Katholieke Univ Leuven, Lab Vaste Stoffys Magnetisme, B-3001 Heverlee, Belgium; Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany; Inst Phys, YU-11080 Belgrade, Yugoslavia; Moscow MV Lomonosov State Univ, Dept Phys, Moscow 119899, Russia
Abstract: We report the measurements of the pseudodielectric function, far-infrared reflectivity, and Raman scattering spectra in Sr14Cu24O41 single crystal. We study the lattice and the spin dynamics of the Cu2O3 spin ladders and CuO2 chains of this compound. The ellipsometric and the optical reflectivity measurements yield the gap values of 1.4, 1.86, 2.34 eV (2.5 eV) for the ladders (chains) along the c axis and 2.4 eV along the a axis. The electronic structure of the Cu2O3 ladders is analyzed using the 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 an 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.
ISSN: 0163-1829
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Solid State Physics and Magnetism Section
× corresponding author
# (joint) last author

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