Abstract
The specific heat Cp and AC susceptibility χ of the high temperature superconductor HoBa2Cu3O7−δ have been measured between 77 and 300 K, in order to evaluate the stability of the system. From the whole specific heat curve approximate values of the Debye temperature ϑD and the electronic specific heat constant γ of the material have been determined. The plot of Cp/T vs. T shows a jump near the superconducting transition temperature Tc. The maximum jump was observed in the freshly prepared sample. After some time, the transition width, seen in both measurements, broadens and the specific heat jump ΔCp/Tc decreases. The specific heat curve broadens towards higher temperatures while the AC susceptibility curve broadens towards lower temperatures. This observation can be qualitatively explained if we assume that, at least, two different types of superconducting microstructures develop with time.
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