| CPC H10N 60/858 (2023.02) [H01F 6/06 (2013.01); H01R 4/68 (2013.01); H10N 60/0352 (2023.02)] | 20 Claims |

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1. A connection structure for a superconducting layer comprising:
a first superconducting layer;
a second superconducting layer; and
a connection layer disposed between the first superconducting layer and the second superconducting layer, the connection layer including crystal grains containing a rare earth element (RE), barium (Ba), copper (Cu), and oxygen (O), the crystal grains having a grain size distribution including a bimodal distribution,
wherein the bimodal distribution includes a first distribution including a first peak and a second distribution including a second peak,
wherein a first grain size corresponding to the first peak is larger than a second grain size corresponding to the second peak, and
wherein, among the crystal grains, crystal grains having a grain size corresponding to the first distribution include a crystal grain having a plate shape or a flat shape.
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