Doping dependence of the superconducting gap in Tl_2Ba_2CuO_{6+delta} from heat transport

Details Doping dependence of the superconducting gap in Tl_2Ba_2CuO_{6+delta} from heat transport Doping dependence of the superconducting gap in Tl_2Ba_2CuO_{6+delta} from heat transport

2005-02-11

arxiv.org/abs/cond-mat/0502273v3

Phys. Rev. B 75, 104518 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 4 figures

Scientific paper

10.1103/PhysRevB.75.104518

We present low-temperature thermal conductivity measurements on the cuprate Tl_2Ba_2CuO_{6+delta} 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, Delta. We find Delta 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.

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