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Doping dependence of superconducting gap in YBa₂Cu₃O_y from universal heat transport

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arxiv cond-mat/0304498 v1 pith:U7F7CHAL submitted 2003-04-22 cond-mat.supr-con cond-mat.str-el

Doping dependence of superconducting gap in YBa₂Cu₃O_y from universal heat transport

Mike Sutherland , D.G. Hawthorn , R.W. Hill , F. Ronning , S. Wakimoto , H. Zhang , C. Proust , E. Boaknin
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C. Lupien M.A. Tanatar J. Paglione R. Liang D.A. Bonn W.N. Hardy Louis Taillefer
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classification cond-mat.supr-con cond-mat.str-el
keywords dopingdependencekappalinearphasepseudogaptermtransport
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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.

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