High-$J_c$ Gd-Ba-Cu-O Epitaxial Films Prepared by Pulsed Laser Deposition
| Autor: | K. Matsumoto, D. Takahara, T. Horide, A. Ichinose, S. Horii, Y. Yoshida, M. Mukaida, K. Osamura |
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| Rok vydání: | 2005 |
| Předmět: |
Superconductivity
Flux pinning High-temperature superconductivity Materials science Condensed matter physics Analytical chemistry Substrate (electronics) Condensed Matter Physics Epitaxy Electronic Optical and Magnetic Materials law.invention Pulsed laser deposition law Cuprate Electrical and Electronic Engineering Thin film |
| Zdroj: | IEEE Transactions on Appiled Superconductivity. 15:2719-2722 |
| ISSN: | 1051-8223 |
| Popis: | For applications of high-temperature cuprate superconductors in magnetic fields at 77 K, a RBa/sub 2/Cu/sub 3/O/sub x/ (R123; R=Nd, Sm, Gd, etc.) film is one of the promising materials due to its high critical temperature T/sub c/ and high irreversibility field B/sub irr/. Especially, a substitution between R and Ba sites that results in a T/sub c/ degradation is not likely to occur in GdBa/sub 2/Cu/sub 3/O/sub x/ (Gd123) films, compared to the cases of Nd and Sm ions. This is an advantage for an application of Gd123 film. We studied the c-axis oriented Gd123 film for obtaining a high critical current density J/sub c/ in a magnetic field at 77 K. The substrate temperature to deposit the epitaxial films on MgO(100) was varied between 700-800/spl deg/C under an oxygen partial pressure of 200 mTorr. T/sub c/ values of the films were within 89.8-92.7 K. Interestingly, the J/sub c/ at 77 K for 5 T (B//c) reached 0.2 MA/cm/sup 2/. The values are three times higher than those of Y123 films, which indicate that Gd123 films have the superior potentiality in magnetic fields at 77 K. |
| Databáze: | OpenAIRE |
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