In order to verify a possibility of a dc voltage predicted on segments of an inhomogeneous superconducting loop the Little-Parks oscillations are investigated on symmetrical and asymmetric Al loops. The amplitude of the voltage oscillations ΔV measured on segments of symmetrical loop increases with the measuring current Im and ΔV=0 at Im=0 in accordance with the classical Little-Parks experiment. Whereas the ΔV measured on segments of asymmetric loop has a maximum value at Im=0. The observation of the dc voltage at Im=0 means that one of the loop segments is a dc power source and others is a load. The dc power can be induced by both thermal fluctuation and a external electric noise.
@article{arxiv.physics/0105059,
title = {Observation of dc voltage on segments of an inhomogeneous superconducting loop},
author = {S. V. Dubonos and V. I. Kuznetsov and A. V. Nikulov},
journal= {arXiv preprint arXiv:physics/0105059},
year = {2007}
}