Properties of MgB2/In composite thick films on ceramic substrates prepared by a screen printing method

In-free and In-added MgB2 thick films were prepared on ceramic substrates (MgO, YSZ, SrTiO3 and Al2O3) using a simple screen printing method. For In-free films, the adhesion between the films and the substrates were very weak; about 10–40% of these films peeled off after firing. We examined the temperature dependence of the resistivity using the non-separated films. These films showed metallic behavior from room temperature to Tc(onset) = 39.7 K and attained zero resistivity at Tc(end point) = 34.0–37.7 K, depending on the kinds of substrate. For In-added films formed on MgO, almost all films adhere well to the substrates and the transport Jc (4.2 K, 0 T) were also improved remarkably; 70 A cm−2 for In-free film and 1.6 × 103 A cm−2 for 18 vol.% In film.