Abstract
Superconductive Bi 2Sr 2CuO 6+ x (Bi-2201) thin films were prepared on MgO (100) substrates by laser ablation using a KrF excimer laser beam and the 4 th harmonics of an Nd:YAG pulse laser beam. A stoichiometric non-substituted Bi-2201 target was used. In the case of using the Nd:YAG laser, as-deposited Bi-2201 thin films showed high crystallinity, semiconductive normal-conductivity and the zero resistance temperature ( T c0) ∼ 4 K, while as-deposited Bi-2201 thin films fabricated by the KrF excimer laser showed high crystallinity, metallic normal-conductivity till a onset of the critical temperature and T c0 ∼ 10 K. This difference suggests that superconductivity of Bi-2201 thin films is related to the existence of activated oxygen during the ablation.
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