Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-09-28
Phys. Rev. Lett. 103, 187401 (2009) -- Published October 27, 2009
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages with 4 figures and EPAPS supplementary online material (3 pages with 4 figures), accepted in Phys. Rev. Lett
Scientific paper
Spectroscopic ellipsometry was used to study the dielectric function of LiCuVO$_{4}$, a compound comprised of chains of edge-sharing CuO$_4$ plaquettes, in the spectral range (0.75 - 6.5) eV at temperatures (7-300) K. For photon polarization along the chains, the data reveal a weak but well-resolved two-peak structure centered at 2.15 and 2.95 eV whose spectral weight is strongly enhanced upon cooling near the magnetic ordering temperature. We identify these features as an exciton doublet in the Mott-Hubbard gap that emerges as a consequence of the Coulomb interaction between electrons on nearest and next-nearest neighbor sites along the chains. Our results and methodology can be used to address the role of the long-range Coulomb repulsion for compounds with doped copper-oxide chains and planes.
Boris A. V.
Horsch Peter
Keimer Bernhard
Kremer Reinhard K.
Matiks Y.
No associations
LandOfFree
Exciton doublet in the Mott-Hubbard LiCuVO$_4$ insulator identified by spectral ellipsometry 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 Exciton doublet in the Mott-Hubbard LiCuVO$_4$ insulator identified by spectral ellipsometry, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Exciton doublet in the Mott-Hubbard LiCuVO$_4$ insulator identified by spectral ellipsometry will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-235633