Low-frequency noise of YBCO/Au junctions

Author

Xu, Y. ; Ekin, J.W. ; Clickner, C.C.

Author_Institution

Nat. Inst. of Stand. & Technol., Boulder, CO, USA

Volume

9

Issue

2

fYear

1999

fDate

6/1/1999 12:00:00 AM

Firstpage

3990

Lastpage

3993

Abstract

We have fabricated ex-situ c-axis YBCO/Au junctions with low contact resistivities. These devices exhibit large low-frequency resistance fluctuations. At room temperature the junction noise spectrum is 1/f like. At liquid nitrogen temperature (77 K) and lower, the noise spectrum depends sensitively on the bias current, with certain bias levels producing clear two-level fluctuation behavior. The normalized resistance noise for these junctions at temperatures below 77 K has an average value of 2 to 3/spl times/10/sup -5/(Hz)/sup -1/2/. We discuss practical issues related to junction noise properties.

Keywords

1/f noise; Josephson effect; barium compounds; contact resistance; gold; high-temperature superconductors; yttrium compounds; 1/f noise; 77 K; YBCO/Au Josephson junction; YBaCuO-Au; contact resistivity; low-frequency noise; resistance fluctuations; resistance noise; two-level system; Annealing; Conductivity; Contact resistance; Gold; High temperature superconductors; Low-frequency noise; Preamplifiers; Superconducting device noise; Temperature sensors; Yttrium barium copper oxide;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.783902

Filename

783902