Bramley, A. P. and Grovenor, C. R. M. and Goringe, M. J. and O'Connor, J. D. and Jenkins, A. P. and Dew-Hughes, D. and Reschauer, N. and Wagner, H. H. and Brozio, W. and Spreitzer, U. and Renk, Karl F. (1998) Film/substrate interactions and superconducting properties of Tl(Ba1-xSrx)(2)Ca2Cu3Oy thin films on (001) SrTiO3 and SrTiO3-buffered (001) MgO substrates. JOURNAL OF MATERIALS RESEARCH, 13 (8). pp. 2057-2066. ISSN 0884-2914,
Full text not available from this repository.Abstract
We have developed a process for the fabrication of (001) oriented SrTiO3 buffer layers onto (001) MgO substrates by rf magnetron sputtering followed by a post-deposition heat treatment in air. Precursor films with Tl : Ba : Ca : Cu ratio 2 : 2 : 2 : 3 were deposited by de magnetron sputtering onto both these buffered substrates and directly onto (001) SrTiO3 single-crystal substrates, and thalliated at elevated temperatures. Because of Sr diffusion from the substrate/buffer layer, and its subsequent substitution for Ba in the superconducting film, the single Tl-O layer phase Tl(Ba1 - xSrx)(2)Ca2Cu3Oy was stabilized. Diffusion of Ba and Ca in the opposite direction led to the formation of a Ba-Ca-Ti-O compound at the interface. The Tl(Ba1 - xSrx)(2)Ca2Cu3Oy films typically have superconducting transition temperatures (T-c's) > 103 K and critical current densities (J(c)'s) > 2.9 x 10(5) A cm(-2) at 77 K. R-s values measured on these films and scaled to 10 GHz were 3.0 m Omega at 80 K and < 200 mu Omega at 50 K for the film grown on SrTiO3 buffered MgO, and 2.0 m Omega and 1.0 m Omega at 50 K for the film grown directly onto the (001) SrTiO3 substrate. Films fabricated on (001) SrTiO3 using an in situ deposition technique with a substrate temperature around 100 degrees C lower than the ex situ thalliation temperature showed no evidence of an interfacial reaction layer.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | WAVE SURFACE-RESISTANCE; CEO2 BUFFERED SAPPHIRE; TL2BA2CA1CU2OX FILMS; TL2BA2CACU2O8 FILMS; YBA2CU3O7 FILMS; TEMPERATURE; GROWTH; LAYERS; DEPOSITION; TL2BA2CA2CU3O10; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Alumni or Retired Professors > Group Karl F. Renk |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 02 May 2023 10:23 |
| Last Modified: | 02 May 2023 10:23 |
| URI: | https://pred.uni-regensburg.de/id/eprint/49634 |
Actions (login required)
 |
View Item |
