Doping dependence of superconducting gap in YBa_2Cu_3O_y from universal heat transport
arXiv:cond-mat/0304498 · doi:10.1016/j.physc.2004.03.104
Abstract
Thermal transport in the T -> 0 limit was measured as a function of doping in high-quality single crystals of the cuprate superconductor YBa_2Cu_3O_y. The residual linear term kappa_0/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 kappa_0/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.
arXiv comment2 pages, 2 figures, submitted to M2S-Rio 2003 Proceedings
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