Coherence and superconductivity in coupled one-dimensional chains: a case study of YBa2_{2}Cu3_{3}Oy_{y}


We report the infrared (IR) response of Cu-O chains in the high-TcT_{c} superconductor YBa2_{2}Cu3_{3}Oy_{y} over the doping range spanning y=6.28βˆ’6.75% 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_{2} planes in establishing metallicity and superconductivity in disordered chain fragments.Comment: 4 pages, 3 figure

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