M. Houssa et al., EFFECT OF ZN DOPING AND OXYGEN STOICHIOMETRY ON THE THERMAL-CONDUCTIVITY OF YBA2CU3O7-DELTA, Superconductor science and technology, 11(1), 1998, pp. 44-48
The temperature dependence of the electronic contribution kappa(e) to
the thermal conductivity of a two-dimensional superconductor with Van
Hove singularities (VHSs) in the density of states is calculated. The
influence of the position of these VHSs from the Fermi level is invest
igated. Various experimental results on the thermal conductivity of YB
a2(Cu1-xZnx)(3)O7-delta compounds with 0 less than or equal to x less
than or equal to 0.017 and 0 less than or equal to delta less than or
equal to 0.3 are analysed using the above model. A simple relation bet
ween x and delta can be extracted from this analysis. This relation is
shown to be correlated with the variation of the Cu(2) valence with o
xygen content and Zn doping.