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Optimization of a/b-axis regions of YBCO thin film for sensor applications

Foroughi Abari, F ; Sharif University of Technology | 2018

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  1. Type of Document: Article
  2. DOI: 10.1007/s40010-017-0392-3
  3. Publisher: Springer , 2018
  4. Abstract:
  5. The effect of substrate temperature on epitaxial growth of Y1Ba2Cu3O7−x film deposited on (100) crystalline lanthanum aluminate (LAO) substrates by RF Sputtering method has been investigated. The crystal mismatch between film and substrate is about 1.6%. The sputtering was carried out in vacuum with base pressure better than 10−5 Torr and 10/20 Pa oxygen/argon partial pressures. Substrate temperature at this condition is about 730 °C based on Bormann–Hammond diagram. As well known, because of the small lattice mismatch between YBCO and LAO, fabricated thin films are not perfectly c-axis and there is tendency to form a/b-axis regions in the film. Due to substantial effects of the density and size of the a/b axis regions on performance of HTS based devices like noise level of high temperature superconductor SQUIDS, optimization of a/b axis regions is crucial. YBCO thin film deposition was performed at different substrate temperatures to find the optimum temperature. The SEM results show that by decreasing deposition temperature in the range of 720–740, a/b axis regions decrease, making the films proper for fabrication of devices such as step-edge junction SQUIDs. © 2017, The National Academy of Sciences, India
  6. Keywords:
  7. RF sputtering ; SQUIDs sensors ; Surface morphology ; YBCO superconductor
  8. Source: Proceedings of the National Academy of Sciences India Section A - Physical Sciences ; Volume 88, Issue 4 , 2018 , Pages 625-628 ; 03698203 (ISSN)
  9. URL: https://link.springer.com/article/10.1007/s40010-017-0392-3