Resistance and Voltage–Current Characteristics of REBCO Superconducting Joint

We discuss resistance and voltage–current characteristics of a REBa<sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub>Cu<sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub>O<italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">_y</i> (REBCO, RE = rare earth) intermediate grown superconducting (iGS) joint. These characteristics are evaluated based on the current decay measurements for a REBCO closed loop. The temperature and magnetic field dependencies of the <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">n</i> value for the iGS joint, assessed using an empirical power-law model, are similar to those observed for REBCO tapes. The percolation model describes the voltage–current characteristics of the iGS joint more accurately. Using the critical current and <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">n</i> values at 10<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">−8</sup> V, we can approximately estimate the upper limit of the current for a low target resistance.