2005/02/28 by D. G. Hawthorn, S. Y. Li, M. Sutherland +14 · 3 citations
Physics and Astronomy · #Advanced Condensed Matter Physics #Physics of Superconductivity and Magnetism #Superconductivity in MgB2 and Alloys #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.75.104518
published as Phys. Rev. B 75, 104518 (2007) · 7 pages, 4 figures
openalex publication_date 2007/03/30 · arxiv created 2007/04/02 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We present low-temperature thermal conductivity measurements on the cuprate Tl2Ba2CuO_6+\ensuremathδ throughout the overdoped regime. In the T\ensuremath→0 limit, the thermal conductivity due to d-wave nodal quasiparticles provides a bulk measurement of the superconducting gap \ensuremathΔ. We find \ensuremathΔ to decrease with increasing doping, with a magnitude consistent with spectroscopic measurements (photoemission and tunneling). This argues for a pure and simple d-wave superconducting state in the overdoped region of the phase diagram, which appears to extend into the underdoped regime down to a hole concentration of \ensuremath≃0.1 hole/Cu. As hole concentration is decreased, the gap-to-Tc ratio increases, showing that the suppression of the superconducting transition temperature Tc (relative to the gap) begins in the overdoped regime.