Magnetization data have been obtained for Nb−33%Zr 0.010-in.-diam wires carrying a transport current I in a constant external longitudinal magnetic field Hext and with a liquid-helium bath temperature of 4.2°K. The variation of magnetization with I for a constant Hext depends on the relative directions of I and Hext. When I is antiparallel to Hext, the specimens were observed to become paramagnetic at a threshold current less than the experimental critical current and remain paramagnetic up to the critical current. A linear relationship between the threshold current and the external field for Hext<500 G is observed.
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Bergeron et al. (1965) studied this question.
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