title: Coherence and superconductivity in coupled one-dimensional chains: a case study of YBa2Cu3Oy.
abstract: We report the infrared (IR) response of Cu-O chains in the high-T(c) superconductor YBa(2)Cu(3)O(y) over the doping range spanning y=6.28-6.75. 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.
authors.affiliation: Department of Physics, University of California at San Diego, La Jolla, California 92093-0319, USA.
authors.forename: Y-S
authors.initials: YS
authors.lastname: Lee
authors.forename: Kouji
authors.initials: K
authors.lastname: Segawa
authors.forename: Yoichi
authors.initials: Y
authors.lastname: Ando
authors.forename: D N
authors.initials: DN
authors.lastname: Basov