Connection structure of superconducting layer, superconducting wire rod, superconducting coil, su

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A connection layer (30) between two superconducting layers (16, 26) includes crystal grains containing a rare earth element (RE), barium (Ba), copper (Cu), and oxygen (O), the crystal grains having a bimodal grain size distribution. A connection method includes applying a slurry onto a superconducting layer, superposing the other superconducting layer, and performing two different heat treatments."