The ac losses in a silver-gold alloy sheathed Bi-2223 tape were measured by the null calorimetric method while a dc current was superimposed onto the ac current. As expected through computer simulations, a Clem valley was observed for the larger ac currents. A reduction of ac losses of approximately 50% at the valley minimum is observed in accord with the calculations. At lower ac currents, the data fit the calculated behavior with a single parameter, a Meissner current of 21.8 A. It is shown that a surface barrier current is incompatible with the data.
Cite
@article{arxiv.cond-mat/9907271,
title = {Decrease of Ac Losses in High Tc Superconducting Tapes by Application of a DC Current},
author = {Benoit des Ligneris and Marcel Aubin and Julian Cave and When Zhu and Patricia Dolez},
journal= {arXiv preprint arXiv:cond-mat/9907271},
year = {2007}
}