We report Raman light-scattering and optical conductivity measurements on a single crystal of La(1.775)Sr(0.225)NiO(4) which exhibits incommensurate charge-stripe order. The extra phonon peaks induced by stripe order can be understood in terms of the energies of phonons that occur at the charge-order wave vector, Q_c. A strong Fano antiresonance for a Ni-O bond-stretching mode provides clear evidence for finite dynamical conductivity within the charge stripes.
@article{arxiv.cond-mat/9909270,
title = {Stripe Conductivity in La(1.775)Sr(0.225)NiO(4)},
author = {Yu. G. Pashkevich and V. A. Blinkin and V. P. Gnezdilov and V. V. Tsapenko and V. V. Eremenko and P. Lemmens and M. Fischer and M. Grove and G. Guentherodt and L. Degiorgi and P. Wachter and J. M. Tranquada and D. J. Buttrey},
journal= {arXiv preprint arXiv:cond-mat/9909270},
year = {2009}
}
Comments
4 pages, 2-col style, including 5 eps figures; Fig.2 replaced with new Raman data plus some small changes to the text