We report the infrared (IR) response of Cu-O chains in the high-Tc superconductor YBa2Cu3Oy over the doping range spanning . We find evidence for a power law scaling at mid-IR frequencies consistent with predictions for Tomonaga-Luttinger liquid, thus supporting the notion of one-dimensional transport in the chains. We analyze the role of coupling to the CuO2 planes in establishing metallicity and superconductivity in disordered chain fragments.
@article{arxiv.cond-mat/0504233,
title = {Coherence and superconductivity in coupled one-dimensional chains: a case study of YBa$_{2}$Cu$_{3}$O$_{y}$},
author = {Y. S. Lee and Kouji Segawa and Yoichi Ando and D. N. Basov},
journal= {arXiv preprint arXiv:cond-mat/0504233},
year = {2009}
}