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Superconducting thin films of MgB2 were deposited by Pulsed Laser Depositionon magnesium oxide and sapphire substrates. Samples grown at 450C in an argonbuffer pressure of about 10-2 mbar by using a magnesium enriched targetresulted to be superconducting with a transition temperature of about 25 K.Film deposited from a MgB2 sintered pellet target in ultra high vacuumconditions showed poor metallic or weak semiconducting behavior and they becamesuperconducting only after an ex-situ annealing in Mg vapor atmosphere. Up tonow, no difference in the superconducting properties of the films obtained bythese two procedures has been evidenced.Comment: 10 pages, 4 figure

As-grown magnesium diboride superconducting thin films deposited by pulsed laser deposition