High superconductor YBCO thin film evaporated on Ni metal layers

Author

Verdyan, A. ; Azoulay, J.

Author_Institution

Dept. of Sci., Holon Acad. Inst. of Technol., Israel

fYear

2000

fDate

2000

Firstpage

49

Lastpage

52

Abstract

A report on our experimental study of the fabrication of YBCO thin film on Ni metal is presented. A simple inexpensive conventional vacuum system consists of a turbomolecular pump and featuring a base pressure better than 10^-3 Pa was used for the YBCO thin film preparation. No device of any kind was applied to control or regulate the thickness or stoichiometry of the film during the evaporation process. During this stage of the evaporation process the substrate temperature was kept at 200°C monitored by a chromel-alumel thermocouple attached to a nearby dummy substrate. The solid phase reaction was subsequently carried out at a temperature of 720°C under low oxygen partial pressure of about 10 Pa for 20 minutes after which a further heat treatment was done at 490°C for 40 minutes. The films thus obtained were evaluated for their electrical and structural properties

Keywords

barium compounds; heat treatment; high-temperature superconductors; stoichiometry; superconducting thin films; superconducting transition temperature; vacuum deposition; yttrium compounds; 200 degC; 490 degC; 720 degC; Ni; Ni metal layers; YBa₂Cu₃O₇; chromel-alumel thermocouple; evaporation; heat treatment; solid phase reaction; stoichiometry; substrate temperature; thickness; thin film; Fabrication; Monitoring; Substrates; Superconducting epitaxial layers; Superconducting thin films; Temperature; Thickness control; Transistors; Vacuum systems; Yttrium barium copper oxide;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical and electronic engineers in israel, 2000. the 21st ieee convention of the

Conference_Location

Tel-Aviv

Print_ISBN

0-7803-5842-2

Type

conf

DOI

10.1109/EEEI.2000.924315

Filename

924315