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Thermal conductivity of Er–Ba–Cu–O and Ho–Ba–Cu–O superconducting bulks

We have measured the temperature dependence of the in-plane thermal conductivity, κab(T), for both Er–Ba–Cu–O and Ho–Ba–Cu–O superconducting bulks. The absolute values of κab(T) for both bulks are smaller than that of Y–Ba–Cu–O bulk, but are larger than that of Dy–Ba–Cu–O bulk, which is known to show an anomalous small κab. κab(T) for Ho–Ba–Cu–O shows a positive slope (dκab/dT>0) in the normal state, similarly to that for Dy–Ba–Cu–O. On the other hand, a slightly negative slope (dκab/dT<0) is found for Er–Ba–Cu–O. The out-of-plane thermal conductivity, κc, was also measured for Er–Ba–Cu–O bulk, and the anisotropy in the thermal conductivity, (κab/κc), was estimated to be about 2.