Doping dependence of superconducting gap in YBa2Cu3Oy from universal heat transport

2003/04/22 by Mike Sutherland, M. Sutherland, D. G. Hawthorn +14
Physics and Astronomy · #Advanced Condensed Matter Physics #Condensed matter physics #Cuprate #Doping #Mott insulator #Phase (matter) #Phase diagram #Physics #Physics of Superconductivity and Magnetism #Pseudogap #Quantum mechanics #Quasiparticle #Superconductivity #Theoretical and Computational Physics #cond-mat.str-el #cond-mat.supr-con

paper · pdf · doi:10.1016/j.physc.2004.03.104

2 pages, 2 figures, submitted to M2S-Rio 2003 Proceedings

arxiv created 2003/04/22 · openalex publication_date 2004/07/06 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

Thermal transport in the T -> 0 limit was measured as a function of doping in high-quality single crystals of the cuprate superconductor YBa₂Cu₃O_y. 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.

Citations

• Electronic Spectra and Their Relation to the(π,π)Collective Mode in High-TcSuperconductors
• Destruction of the Fermi surface in underdoped high-Tc superconductors
• Superconducting Gap Anisotropy and Quasiparticle Interactions: A Doping Dependent Photoemission Study