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Strain dependence of superconducting characteristics in technical Nb3Al superconductors

The strain dependence of not only the critical current (Ic) but also the n-value in technical Nb3Al wires prepared with the rapid-heating, quenching and transformation (RHQT) method has been measured with the modified Walters spring (WASP), which allows us to measure the voltage–current relation down to less than the 0.1 µV cm−1 criterion, an important requirement in view of the applications like NMR spectroscopy operated in a persistent current mode. The measurement was made in fields up to 17 T and at 4.2 K, for several kinds of Nb3Al wires, including stabilized wires and wires with a tantalum matrix.