Resistance drift and 1/f2 voltage spectra in the high-Ic superconducting transition region

Publisher Website
Google Scholar
Abstract
In the past many debates have arisen over the appearance of 1/f2 voltage spectra in the process of measuring electrical noise. In this paper, we will look at the theory of resistance drift causality to the 1/f2 spectra and how the measurement system affects these measurements. A superconductor operating in its transition region is a perfect test case for examining this area since vacancy fluctuations do not seem to occur. We can generalize that an acquired 1/f2 signal is a result of the drifting resistance and proceed to analyze the data. Our measurements indicate that the traditional theoretical case of a 1/f2 spectra resulting from a simple voltage ramp due to resistance drift is not entirely valid in a real‐world measurement system because the input circuitry to the amplifier causes attenuation. A mathematical solution for the effect of drifting resistance when coupled with the input circuitry was developed and fit quite well to the measured signals.

This publication has 0 references indexed in Scilit: