Abstract
We have performed low temperature (≤20 K) specific heat measurements on eight samples of super-conducting YxBa3−xCu3O7−δ (with x = 0.9, 1.0 and 1.1 respectively), and on two samples of non-superconducting YBa2Cu3O6. We have also measured their d.c. magnetic susceptibility between 100 and 250 K. The superconducting samples all have a non-zero, sample-dependent linear term γ∗, and an upturn in C/T at very low temperature. The non-superconducting samples exhibit a similar behaviour. We find that γ∗ is correlated with the Curie component of the suceptibility. As the latter is proportional to the amount of paramagnetic impurities, this means that γ∗ is largely due to the presence of impurities in the samples.
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