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Abstract:
The thermal conductivity at T < 0.5K parallel to the CuO2 planes in
single crystalline YBa2Cu3O6.9 can be decomposed as kappa-a,b(T) =
kappa-phonon(T) + A.T, while kappa-c(T) = kappa-phonon(T). This is
explained by a model calculation, assuming that superconductivity is
generated in the CuO2 layers and weak superconductivity is induced in
the CuO chains by the proximity effect.