Abstract
YBa2Cu3O7−x (YBCO) films of 110nm thickness were prepared on LaAlO3 (LAO) substrates via the sol–gel method. Subsequently, about 400nm thick Ba0.09Sr0.91TiO3 (BST) films were epitaxially grown on the YBCO and LNO films surface; the BST films exhibited a strong c-axis orientation. The dielectric adjustability and relative dielectric constant was investigated in the range of 300-83K. Results indicate that the tunability of the Ba0.09Sr0.91TiO3/YBa2Cu3O7−x (BST/YBCO) displayed an increase relative to c-axis-oriented BST on LaNiO3 (LNO). The tunability was further enhanced as the operating temperature decreased, yet the loss tangent (tanδ) decreased. The tunability and the tanδ at 100kHz and 83K were 58% and 0.029, respectively.
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