Original scientific paper
Measurements of I-V curves of superconductors with subnanovolt resolution
Željko Marohnić
; Institute of Physics of the University, P.O.Box 304, 41001 Zagreb, Croatia
Abstract
A simple method for the measurements of I-V curves of superconductors with the voltage sensitivity of about 0.1 nV is described in some detail. The superposition of a very low sinusoidally varying alternating current IA on much larger computer controlled direct current ID is fed into the sample and the resulting signal from the phase sensitive amplifier numerically integrated yielding the I-V curve. The sensitivity of the method is demonstrated by measuring the I-V curve of an Ag-clad (Bi,Pb)2Sr2Ca2Cu3O10+y tape. The experimental set-up employed in these measurements is also described and some possible uses of the method discussed.
Keywords
Hrčak ID:
299424
URI
Publication date:
1.3.1994.
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