MAGNETIZATION DIFFERENCES AT THE A-B TRANSITION OF SUPERFLUID HE-3

We report results from a new SQUID-based measurement of the total magn etization change of superfluid He-3 at the A-B phase transition, DELTA M(AB)(total). We used a simple first-principles calibration technique. At low fields approximately 0.03 T, our data agree with past measurem ents, verifying the long-standing discrepancy between DELTAM(AB)(total ) and DELTAM(AB)(nuclear), the magnetization change which is measured by NMR. Use of a self-shielded solenoid allowed the first measurement of DELTAM(AB)(total) over the full range of magnetic field. We found t he magnetization discrepancy to persist through the whole phase diagra m.