C. FERDEGHINI

We report specific heat measurements on neutron-irradiated MgB2 samples, for which the critical temperature is lowered to 8.7 K, but the superconducting transition remains extremely sharp, indicative of a defect structure extremely homogeneous. Our results evidence the presence of two superconducting gaps in the temperature range above 21 K,...

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The employment of superconducting thin films as electronic devices seems to be the most probable future application of these materials. For this application, thin films with extremely smooth surface and very good superconducting as well as structural properties are required. We deposited YBCO epitaxial thin films by pulsed laser ablation using...

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Magnetic and electrical transport properties of artificially layered [(BaCuO2)(2)/(CaCuO2)(2)](N) superlattices grown by pulsed laser deposition have been investigated. It has been found that these superlattices have a metallic normal state resistivity with a transition temperature of about 74 K. The holes concentration, from Hall measurements,...

In this paper, a study of the effect of Al substitution on the upper critical field, Bc2, in AlxMg1−xB2 samples is presented. We find a straightforward correlation between Bc2 and the σ-band gap, Δσ, evaluated by pointcontact measurements. Up to x=0.2, Bc2 can be well described within a clean limit model and its decrease with x is directly...

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