Current sharing in a fully stabilized superconductor

摘要

The dynamic behavior of a fully stabilized superconducting composite is studied by observing terminal voltagesV, temperaturesT, and magnetic fieldsHbas a function of transport currentsIwithout an applied magnetic field. The current sharing in the resistive state of the composite is confirmed by measuringHbin the vicinity of a composite in which superconducting filaments are arranged in a special configuration in a copper matrix. An observedI‐Hbdiagram agreed well with that calculated from a fraction of the current sharing obtained from analyzing an observedI‐Vdiagram, under an assumption which regarded the composite as a parallel circuit composed of superconducting filaments and a copper matrix. In the resistive state, it was confirmed that the current in filaments exceeded the critical current of the bare filaments and the differential resistance of the composite was smaller than the resistance of the copper matrix.