Abstract
The thermal conductivity κ of Pr doped YBa2Cu3Oy (Y1−xPrxBa2Cu3Oy) polycrystals has been studied as a function of temperature from 10 K up to 150 K. A pure YBCO crystal exhibits a clear enhancement in κ belowT c but for highly Pr doped samples (x>0.2) the temperature dependence of κ monotonically decreases with reducing temperature. Furthermore, the value of κ of insulating PBCO (x=1.0) is strongly suppressed compared with that of superconducting YBCO. Such behaviour is not explained by the electron-phonon interaction model proposed by Bardeen, Rickayzen and Tewordt but suggests a picture in which an observed peak belowT c in κ of the pure YBCO sample is ascribed to a quasiparticle contribution.
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