Research Information System
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM, vol.26, no.9, pp.2931-2936, 2013 (SCI-Expanded)
We report on measurements of the evolution of themagnetization < M > upon warming from T-0 ( 20, 30, 50 K) to T-c, for Bi:2223/Ag tape prepared by the continuous filling and forming (CTFF) with the magnetization < M > initially situated along bridges between the envelopes of the major hysteresis curves. We focused on the cases where < M > = 0, the constituent moments cancel each other exactly. We have measured the release of magnetic moments as a function of temperature. < M > versus T traces S shaped curves where after tracing a valley the paramagnetic magnetization is followed by the appearance of a diamagnetic peak, which is then extinguished as T attains T-c. Our observations, evidence for hidden magnetization, have been explained on the basis of the critical state model assuming certain dependence of the critical current density and Meissner surface current on temperature.