Absence of residual quasiparticle conductivity in the underdoped cuprate YBa2Cu4O8

Details Absence of residual quasiparticle conductivity in the underdoped cuprate YBa2Cu4O8 Absence of residual quasiparticle conductivity in the underdoped cuprate YBa2Cu4O8

2000-04-06

arxiv.org/abs/cond-mat/0004094v3

Phys. Rev. Lett. vol. 85, 4140 (2000)

Physics

Condensed Matter

Superconductivity

RevTex, 4 pages, 2 figures, Revised version

Scientific paper

10.1103/PhysRevLett.85.4140

We report here measurements of the in-plane thermal conductivity K(T) of the underdoped cuprate YBa2Cu4O8 (Y124) below 1K. K(T) is shown to follow a simple, phononic T^3 dependence at the lowest temperatures for both current directions, with a negligible linear, quasiparticle contribution. This observation is in marked contrast with behavior reported in optimally doped cuprates, and implies that extended zero-energy (or low energy) low-energy quasiparticles are absent in YBa2Cu4O8 at low temperatures.

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