Reply to "Sharp-mode coupling in High-Tc Superconductors"

Details Reply to "Sharp-mode coupling in High-Tc Superconductors" Reply to "Sharp-mode coupling in High-Tc Superconductors"

2004-11-23

arxiv.org/abs/cond-mat/0411579v1

Nature 432, brief communications arising, Nov 18, 2004

Physics

Condensed Matter

Superconductivity

Three pages, one figure, reply to Cuk et al. cond-mat/0403743

Scientific paper

Our optical technique has the advantage of being a bulk probe, which is less subject to uncertainties in the doping level and in the quality of the surface than angle resolved photoemission (ARPES). It is also capable of higher energy resolution and the overall noise level is lower. The disadvantage is that it gives momentum averaged properties. In light of these differences, it came as a surprise to us that our reported optical self-energies were able to track in accurate detail the ARPES self-energies of Johnson et al. Our data indicate that, as a function of doping, not only could both optical and ARPES techniques resolve the sharp mode from the background but also that the sharp mode intensity decreases uniformly, disappearing completely at a doping level of 0.23. As superconductivity is still strong at this doping level, with a Tc of 55 K, we conclude that the sharp mode was not an important contributor to high-temperature superconductivity.

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