Abstract
Resistive evaporation technique was used to fabricate polycrystalline YBaCuO and YBaNaCuO thin films on MgO substrates. Heat treatment was carried out in a low oxygen partial pressure. Polycrystalline YBCO and Na doped YBCO thin films samples were thus obtained using the same technique and conditions. The critical current density of Na doped YBCO sample was measured to be significantly higher than that of the undoped YBCO one. The results are discussed in terms of the Na contribution to the intragrain conductivity.
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