Effect of the cooling time in YBa/sub 2/Cu/sub 3/O/sub 7/(7-/spl delta/) film-growth process on grain boundary Josephson junctions for small-scale circuits

Author

Ogawa, T. ; Koyanagi, M.

Author_Institution

Electrotech. Lab., Tsukuba, Japan

Volume

7

Issue

2

fYear

1997

fDate

6/1/1997 12:00:00 AM

Firstpage

3319

Lastpage

3322

Abstract

We have studied the effect of the cooling time of YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// films on the properties of bicrystal Josephson junctions. In the three regions of the cooling time as 5/spl sim/6, 10/spl sim/20, and more than 30(min.), the junctions´ Tc were above 87K, 50/spl sim/86K and above 86K, and the average value of the IcRn products at 77K were 0.12mV, 50/spl mu/V, and 80/spl mu/V, respectively. The junction´s Tc, the I-V curves, and the junction parameters were changed due to the change of the cooling time. As a result, it was found that the cooling time was very important factor to determine the junction properties.

Keywords

Josephson effect; barium compounds; bicrystals; grain boundaries; high-temperature superconductors; superconducting thin films; yttrium compounds; I-V characteristics; YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// film growth; YBa/sub 2/Cu/sub 3/O/sub 7/; bicrystal grain boundary Josephson junction; cooling time; critical current normal resistance product; critical temperature; small-scale circuit; Cooling; Gas lasers; Grain boundaries; Josephson junctions; Pulsed laser deposition; Substrates; Superconducting films; Temperature distribution; X-ray scattering; Yttrium barium copper oxide;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.622072

Filename

622072