Universal Heat Conduction in YBa2Cu3O6.9
Louis Taillefer, Benoit Lussier, Robert Gagnon, Kamran Behnia, Herve Aubin
Abstract
The thermal conductivity of YBa2Cu3O6.9 was measured at low temperatures in untwinned single crystals with concentrations of Zn impurities from 0 to 3% of Cu. A linear term kappa0/T = 0.19 mW/K2.cm is clearly resolved as T -> 0, and found to be virtually independent of Zn concentration. The existence of this residual normal fluid strongly validates the basic theory of transport in unconventional superconductors. Moreover, the observed universal behavior is in quantitative agreement with calculations for a gap function of d-wave symmetry.
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