Multilayer ferroelectric-high T/sub c/ structures with poled ferroelectric layers
| Autor: | D.K. Fork, M.Y. Avello, J.B. Boyce, Grover L. Larkins |
|---|---|
| Rok vydání: | 1995 |
| Předmět: |
Positive shift
Materials science High-temperature superconductivity Poling Superconducting thin films Analytical chemistry Condensed Matter Physics Ferroelectricity Electronic Optical and Magnetic Materials law.invention law Ferroelectric thin films Superconducting transition temperature Electrical and Electronic Engineering Thin film |
| Zdroj: | IEEE Transactions on Appiled Superconductivity. 5:3049-3052 |
| ISSN: | 1051-8223 |
| DOI: | 10.1109/77.403235 |
| Popis: | We have observed shifts of from 0.5 to -6/spl deg/K in the T/sub C(ONSET/) of YBa/sub 2/Cu/sub 3/O/sub 7-x/(123) in laser ablated thin film 123-BaTiO/sub 3/ multilayer structures on (100) oriented LaAlO/sub 3/ upon poling of the BaTiO/sub 3/ with a positive potential. Poling was carried out at between 120 and 150/spl deg/C in air with an applied field of about 10/sup 5/ V/cm after which a positive shift in the T/sub C(ONSET/) of the 123 by an amount of approximately 1/spl deg/K was observed. Samples were also poled at room temperature (20/spl deg/C) with an applied field of 10/sup 6/ V/cm (2-6/spl deg/K shift observed depending on T/sub c/ (R=0)). Negative potentials showed no apparent shift in T/sub C(ONSET/). A dc-poling with no applied field at 150/spl deg/C for 10-30 minutes in air was observed to restore the R vs. T curve to its original, unpoled, state. Details of the deposition parameters, structures and the mast recently obtained results will be presented possible explanations for the effect will also be discussed. > |
| Databáze: | OpenAIRE |
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