Onset of a Boson mode at the superconducting critical point of underdoped YBa2Cu3Oy.

  title={Onset of a Boson mode at the superconducting critical point of underdoped YBa2Cu3Oy.},
  author={Nicolas Doiron-Leyraud and Michael L. Sutherland and S Y Li and Louis Taillefer and Ruixing Liang and Douglas A. Bonn and W. N. Hardy},
  journal={Physical review letters},
  volume={97 20},
The thermal conductivity kappa of underdoped YBa2Cu3Oy was measured in the T-->0 limit as a function of hole concentration p across the superconducting critical point at pSC identical with 5.0%. The evolution of bosonic and fermionic contributions to kappa was tracked as the doping level evolved continuously in each of our samples. For p< or =pSC, we observe a T3 component in kappa which we attribute to the boson excitations of a phase with long-range spin or charge order. Fermionic transport… Expand

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