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Phys. Rev. B 75, 104518 (2007) [6 pages]

Doping dependence of the superconducting gap in Tl2Ba2CuO6+δ from heat transport

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D. G. Hawthorn*, S. Y. Li†, M. Sutherland‡, Etienne Boaknin, R. W. Hill§, C. Proust**, F. Ronning††, M. A. Tanatar‡‡, Johnpierre Paglionea, and Louis Tailleferb
Department of Physics, University of Toronto, Toronto, Canada M5S 1A7

D. Peets, Ruixing Liang, D. A. Bonn, and W. N. Hardy
Department of Physics and Astronomy, University of British Columbia, Vancouver, Canada V6T 1Z4

N. N. Kolesnikov
Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Russia

Received 18 December 2006; published 30 March 2007

We present low-temperature thermal conductivity measurements on the cuprate Tl2Ba2CuO6+δ throughout the overdoped regime. In the T→0 limit, the thermal conductivity due to d-wave nodal quasiparticles provides a bulk measurement of the superconducting gap Δ. We find Δ 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 ≃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.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.75.104518
DOI:
10.1103/PhysRevB.75.104518
PACS:
74.25.Fy, 74.72.Jt

*Present address: Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia, Canada.

†Present address: Département de physique and RQMP, Université de Sherbrooke, Sherbrooke, Canada.

‡Present address: Cavendish Laboratory, University of Cambridge, Cambridge, UK.

§Present address: Department of Physics, University of Waterloo, Waterloo, Canada.

**Present address: Laboratoire National des Champs Magnétiques Pulsés, Toulouse, France.

††Present address: Los Alamos National Lab, Los Alamos, NM, USA.

‡‡Present address: Département de physique and RQMP, Université de Sherbrooke, Sherbrooke, Canada; Permanent address: Institute of Surface Chemistry, N.A.S., Ukraine.

aPresent address: Department of Physics, University of California, San Diego, La Jolla, CA, USA.

bPresent address: Département de physique and RQMP, Université de Sherbrooke, Sherbrooke, Canada. Electronic address: Louis.Taillefer@USherbrooke.ca

 
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