In this study, we analyzed the magnetic properties of a superconducting flat ring manufactured using GdBa2Cu3O7-δ (GdBCO) coated conductors by making a narrow path in order to confirm the contact region that can occur when fabricating a superconducting Roebel cable. We analyzed the local magnetic field distributions and magnetic hysteresis curves of the samples by using Scanning Hall Probe Microscopy (SHPM). The current distribution in the sample was calculated based on the measured local magnetic field distribution, and the shape of the current distribution in the sample was investigated at various temperature. We focused that the magnetic properties of the narrow path change near the critical temperature, and we describe the phenomenon using the demagnetizing field effect. In conclusion, we confirmed that the narrow path between each strand on the Roebel cable can cause the coupling strength near the critical temperature of the superconducting sample.
Thesis Advisor: Prof. Hyeong-Cheol Ri