In this paper we describe a superconducting chopper amplifier used as an instrument to measure the V(I) curve of multifilamentary superconductors. Experimental results are presented.
van Overbeeke, F., ten Kate, H. H. J., & van de Klundert, L. J. M. (1987). A superconducting modulator for extremely sensitive voltage measurements across multifilamentary superconducting wires. IEEE transactions on magnetics, 23(2), 1413-1416. https://doi.org/10.1109/TMAG.1987.1065108