Comment on "Onset of Boson Mode at the Superconducting Critical Point of Underdoped YBa2Cu3Oy"

Details Comment on "Onset of Boson Mode at the Superconducting Critical Point of Underdoped YBa2Cu3Oy" Comment on "Onset of Boson Mode at the Superconducting Critical Point of Underdoped YBa2Cu3Oy"

2007-11-29

arxiv.org/abs/0711.4654v1

Phys. Rev. Lett. 100, 029701 (2008)

Physics

Condensed Matter

Superconductivity

Accepted for publication in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.100.029701

In a recent Letter [Phys. Rev. Lett. 97, 207001 (2006)], Doiron-Leyraud et
al. reported a study of low-temperature thermal conductivity of underdoped
YBa2Cu3Oy across the superconductor-insulator boundary and argued for a novel
bosonic mode as well as charge-neutral fermions. In this Comment, we show that
both of these claims are dubious.

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