Speaker
Description
We present trapped magnetic flux data of Nb3Sn films on copper substrates. The samples are prepared via DC magnetron sputtering and bronze-route. Additionally, we test samples with an insulating layer between substrate and superconductor, which was deposited via atomic layer deposition. By cooling down the sample with various temperature gradients and measuring the resulting trapped magnetic flux we can characterize how susceptible samples are to thermoelectric currents. Our results show that for the same material combination the measured trapped flux can vary by over an order of magnitude. This highlights the impact of the film’s morphologic properties on trapped flux due to thermoelectric currents. They also show the potential of an insulating layer to suppress the thermoelectric currents in the bi-metallic structures.