Doping evolution of nodal quasiparticles in the cuprate superconductor YBCO via low-temperature thermal conductivity

ORAL

Abstract

The thermal conductivity of the cuprate superconductor YBa$_2$Cu$_3$O$_y$ was measured at temperatures down to $T \sim 50$~mK in magnetic fields up to $H=15$~T on high-quality single crystals with a hole doping ranging from $p = 0.08$ to $p = 0.18$. The residual linear term at $T \to 0$, a direct measure of the nodal quasiparticle velocities [1], is tracked as a function of doping, and compared to recent, high-resolution ARPES measurements of the Fermi velocity and gap magnitude as a function of doping, in the related cuprate superconductor Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$ [2]. \\[4pt] [1] D.G. Hawthorn {\it et al.}, Phys. Rev. B {\bf 75}, 104518 (2007). \\[0pt] [2] I.M. Vishik {\it et al.}, Phys. Rev. Lett. {\bf 104}, 207002 (2010).

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Authors

  • Samuel Rene de Cotret

    University of Sherbrooke, Sherbrooke, Canada

  • J.-Ph. Reid

    University of Sherbrooke, Sherbrooke, Canada

  • N. Doiron-Leyraud

    University of Sherbrooke, Sherbrooke, Canada

  • Louis Taillefer

    University of Sherbrooke, Sherbrooke, Canada

  • Brad Ramshaw

    University of British Columbia, Vancouver, Canada, Department of Physics and Astronomy, University of British Columbia

  • Ruixing Liang

    University of British Columbia, Vancouver, Canada, Department of Physics and Astronomy, University of British Columbia

  • Doug Bonn

    University of British Columbia, Vancouver, Canada, Department of Physics and Astronomy, University of British Columbia

  • Walter Hardy

    University of British Columbia, Vancouver, Canada, Department of Physics and Astronomy, University of British Columbia