Absence of residual quasiparticle conductivity in the underdoped cuprate YBa2Cu4O8

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  • 6 April 2000
Abstract
We report here measurements of the in-plane thermal conductivity K(T) of the underdoped cuprate YBa2Cu4O8 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 or weakly localized low-energy quasiparticles are absent in YBa2Cu4O8 at low temperatures.

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