Doping dependence of superconducting gap in YBa2Cu3Oy from universal heat transport

Thermal transport in the T- > 0 limit was measured as a function of doping in high-quality single crystals of the cuprate superconductor YBa2Cu3Oy. The residual linear term kappa0/T is found to decrease as one moves from the overdoped regime towards the Mott insulator region of the phase diagram....

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Published in:Physica. C, Superconductivity Superconductivity, 2004-08, Vol.408-410, p.672-673
Main Authors: Sutherland, Mike, Hawthorn, D.G., Hill, R.W., Ronning, F., Zhang, H., Boaknin, E., Tanatar, M.A., Paglione, J., Liang, R., Bonn, D.A., Hardy, W.N., Taillefer, Louis
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Language:English
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Summary:Thermal transport in the T- > 0 limit was measured as a function of doping in high-quality single crystals of the cuprate superconductor YBa2Cu3Oy. The residual linear term kappa0/T is found to decrease as one moves from the overdoped regime towards the Mott insulator region of the phase diagram. The doping dependence of the low-energy quasiparticle gap extracted from kappa0/T is seen to scale closely with that of the pseudogap, arguing against a non-superconducting origin for the pseudogap. The presence of a linear term for all dopings is evidence against the existence of a quantum phase transition to an order parameter with a complex (ix) component.
ISSN:0921-4534
DOI:10.1016/j.physc.2004.03.104