Thermal conductivity across the phase diagram of cuprates: Low-energy quasiparticles and doping dependence of the superconducting gap

Mike Sutherland, D. G. Hawthorn, R. W. Hill, F. Ronning, S. Wakimoto, H. Zhang, C. Proust, Etienne Boaknin, C. Lupien, Louis Taillefer, Ruixing Liang, D. A. Bonn, W. N. Hardy, Robert Gagnon, N. E. Hussey, T. Kimura, M. Nohara, H. Takagi

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188 Citations (Scopus)

Abstract

Heat transport in the cuprate superconductors YBa2Cu3Oy and La2−xSrxCuO4 was measured at low temperatures as a function of doping. A residual linear term κ0/T is observed throughout the superconducting region and it decreases steadily as the Mott insulator is approached from the overdoped regime. The low-energy quasiparticle gap extracted from κ0/T is seen to scale closely with the pseudogap. The ubiquitous presence of nodes and the tracking of the pseudogap shows that the overall gap remains of the pure d-wave form throughout the phase diagram, which excludes the possibility of a complex component (ix) appearing at a putative quantum phase transition and argues against a nonsuperconducting origin to the pseudogap. A comparison with superfluid density measurements reveals that the quasiparticle effective charge is weakly dependent on doping and close to unity.

Original languageEnglish
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume67
Issue number17
DOIs
Publication statusPublished - May 23 2003
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Sutherland, M., Hawthorn, D. G., Hill, R. W., Ronning, F., Wakimoto, S., Zhang, H., Proust, C., Boaknin, E., Lupien, C., Taillefer, L., Liang, R., Bonn, D. A., Hardy, W. N., Gagnon, R., Hussey, N. E., Kimura, T., Nohara, M., & Takagi, H. (2003). Thermal conductivity across the phase diagram of cuprates: Low-energy quasiparticles and doping dependence of the superconducting gap. Physical Review B - Condensed Matter and Materials Physics, 67(17). https://doi.org/10.1103/PhysRevB.67.174520