TITLE

Bulk dc SQUID in a Tl-based ceramic: Shapiro steps, signal, and noise properties at 77 K

AUTHOR(S)
Robbes, D.; Sing, M. Lam Chok; Monfort, Y.; Bloyet, D.; Provost, J.; Raveau, B.
PUB. DATE
March 1989
SOURCE
Applied Physics Letters;3/20/1989, Vol. 54 Issue 12, p1172
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The current-voltage characteristic at 77 K of a constricted thallium-based high Tc superconducting sample exhibits Shapiro steps and is modulated by a dc magnetic field. This device operates as a dc superconducting quantum interference device with a maximum critical current Ic of 350 μA, a dynamic resistance up to 30 Ω, and a transfer parameter as high as 1.5 mV/[uppercase_phi_synonym]0 for an estimated inductance of 40 pH. The measured spectral density of the flux noise in the white noise region is 1.4×10-10 [uppercase_phi_synonym]20/Hz. The 1/f noise at 1 Hz is 2.1×10-7 [uppercase_phi_synonym]20/Hz and is reduced by a factor of 10 by a synchronous detection. Implications for thin-film devices are examined.
ACCESSION #
9830411

 

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