THERMODYNAMIC MAGNETIZATION DISCONTINUITY BETWEEN THE A-PHASE AND B-PHASE OF SUPERFLUID HE-3

We present data for the magnitude of the thermodynamic magnetization d iscontinuity at the equilibrium A-B transition in superfluid He-3, Del ta M(AB), over its entire pressure-temperature-magnetic field phase di agram. The data was taken by measuring flux changes in a SQUID pick-up coil, which was calibrated by a novel first-principles technique. We compare our results with those of NMR experiments, and find that the t wo types of measurements yield different values, and this discrepancy is not the result of thermometry or field errors.