LuBa2Cu3O(7-x) thin films prepared using MOCVDстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:LuBa2Cu3O7-x thin films with Tc= 86-88 K were prepared by flash evaporation MOCVD on LaAlO3, SrTiO3, Zr02(Y203) and NdGaO3 single-crystal substrates (deposition temperature 795oC, partial oxygen pressure 1.35 Torr). Values for the critical current density, jc (77 K, H = 100 Oe), of 9 x 10 5, 1.1 x 10 6 and 1.2 x 10 6 A cm-2 were measured for films on ZrO2(Y2O3), SrTi03 and LaA103 respectively. The calculated magnitude of |djc/dT| for LuBa2Cu3O7-x films on coherent substrates was found to be higher than that of YBa2Cu3O7-x films, indicating a more efficient magnetic flux pinning mechanism. The temperature dependence of conductivity fluctuations was considered in terms of a Lawrence-Donniach model and a 3D-2D dimensional crossover was registered for the films on SrTiO3.