Universal Heat Conduction in YBa_2Cu_3O_6.9

Details Universal Heat Conduction in YBa_2Cu_3O_6.9 Universal Heat Conduction in YBa_2Cu_3O_6.9

1997-06-03

arxiv.org/abs/cond-mat/9706025v1

Physics

Condensed Matter

Superconductivity

Latex file, 4 pages, 3 EPS figures, to appear in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.79.483

The thermal conductivity of YBa_2Cu_3O_6.9 was measured at low temperatures in untwinned single crystals with concentrations of Zn impurities from 0 to 3% of Cu. A linear term kappa_0/T = 0.19 mW/K^2.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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