THEORY OF THERMAL-CONDUCTIVITY IN YBA2CU3O7-DELTA

We calculate the electronic thermal conductivity in a d-wave supercond uctor, including both the effect of impurity scattering and inelastic scattering by antiferromagnetic spin fluctuations. We argue that phono ns dominate heat transport near T-c, but that electrons are responsibl e for most of the peak observed in clean samples, The peak position is predicted to vary nonmonotonically with disorder, in good agreement w ith experiments on YBa2(Cu1-xZnx)(3)O-7-delta.